Pub Date : 2003-08-01DOI: 10.1179/096797803225004945
S. Nair, P. Warriar, J. Koshy
Abstract Barium holmium niobate Ba2HoNbO6 (BHNO) has been developed as a new substrate for (Bi,Pb)2Sr2Ca2Cu3Ox (Bi(2223)) superconductor film. Ba2HoNbO6 has a cubic perovskite structure with lattice constant a = 8·26 Å. The dielectric constant and loss factor of this material are in a range suitable for its use as a substrate for microwave applications. The Bi(2223) superconductor shows no detectable chemical reaction with BHNO, even under extreme processing conditions. Dip coated Bi(2223) thick film on Ba2HoNbO6 substrate had T c(0) of 109 K and current density of around 4 × 103 A cm - 2 at 77 K and in zero magnetic field.
摘要:研究了铌酸钡(Ba2HoNbO6, BHNO)作为(Bi,Pb)2Sr2Ca2Cu3Ox (Bi(2223))超导体薄膜的新型衬底材料。Ba2HoNbO6具有立方钙钛矿结构，晶格常数a = 8·26 Å。这种材料的介电常数和损耗系数在一个范围内，适合作为微波应用的衬底。即使在极端的加工条件下，Bi(2223)超导体也不会与BHNO发生可检测到的化学反应。在Ba2HoNbO6衬底上浸镀Bi(2223)厚膜，在77 K和零磁场条件下，tc(0)为109 K，电流密度约为4 × 103 A cm - 2。
{"title":"Superconducting Bi(2223) thick film on Ba2HoNbO6: a new perovskite ceramic substrate","authors":"S. Nair, P. Warriar, J. Koshy","doi":"10.1179/096797803225004945","DOIUrl":"https://doi.org/10.1179/096797803225004945","url":null,"abstract":"Abstract Barium holmium niobate Ba2HoNbO6 (BHNO) has been developed as a new substrate for (Bi,Pb)2Sr2Ca2Cu3Ox (Bi(2223)) superconductor film. Ba2HoNbO6 has a cubic perovskite structure with lattice constant a = 8·26 Å. The dielectric constant and loss factor of this material are in a range suitable for its use as a substrate for microwave applications. The Bi(2223) superconductor shows no detectable chemical reaction with BHNO, even under extreme processing conditions. Dip coated Bi(2223) thick film on Ba2HoNbO6 substrate had T c(0) of 109 K and current density of around 4 × 103 A cm - 2 at 77 K and in zero magnetic field.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134115947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-08-01DOI: 10.1179/096797803225004990
A. Sahu, D. Kumar, O. Parkash, O. P. Thakur, C. Prakash
Abstract Dielectric properties of glass ceramics prepared in the [(Pb1 - xSrx)O.TiO2)]- [2SiO2.B2O3]-[K2O] system have been studied. The Curie temperature of crystalline phases has been found to decrease with decreasing Pb2+/Sr2+ ratio in the initial glass. This adds support to the authors' previous findings from XRD peak intensity studies suggesting that the crystallites are in solid solution in the system (Pb1 - xSrx)TiO3.
{"title":"Dielectric properties of [(Pb1 - xSrx)O.TiO2)]-[2SiO2.B2O3]-[K2O] glass ceramics","authors":"A. Sahu, D. Kumar, O. Parkash, O. P. Thakur, C. Prakash","doi":"10.1179/096797803225004990","DOIUrl":"https://doi.org/10.1179/096797803225004990","url":null,"abstract":"Abstract Dielectric properties of glass ceramics prepared in the [(Pb1 - xSrx)O.TiO2)]- [2SiO2.B2O3]-[K2O] system have been studied. The Curie temperature of crystalline phases has been found to decrease with decreasing Pb2+/Sr2+ ratio in the initial glass. This adds support to the authors' previous findings from XRD peak intensity studies suggesting that the crystallites are in solid solution in the system (Pb1 - xSrx)TiO3.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"40 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115913596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-08-01DOI: 10.1179/096797803225004981
A. Sahu, D. Kumar, O. Parkash
Abstract The crystallisation of lead strontium titanate solid solution phase in glass ceramics in the [(Pb1 - xSrx)O.TiO2] - [2SiO2.B2O3]-[K2O]system (x = 0, 0·1, 0·2, 0·3, 0·4) has been studied. Perovskite titanate was found to be the major phase in all samples investigated. The actual composition of the crystallites developed could not be confirmed on the basis of shifts in the XRD peak positions with changing Pb2+/Sr2+ ratio, because of similar effects due to solid solution and strain resulting from crystal clamping. Comparison of the observed intensities of the perovskite titanate phase with calculated intensities for (Pb1 - xSrx)TiO3 ceramics with the same lead/strontium ratios confirmed the formation of lead strontium titanate solid solution.
{"title":"Crystallisation of lead strontium titanate perovskite phase in [(Pb1-xSrx)O.TiO2]- [2SiO2.B2O3]-[K2O] glass ceramics","authors":"A. Sahu, D. Kumar, O. Parkash","doi":"10.1179/096797803225004981","DOIUrl":"https://doi.org/10.1179/096797803225004981","url":null,"abstract":"Abstract The crystallisation of lead strontium titanate solid solution phase in glass ceramics in the [(Pb1 - xSrx)O.TiO2] - [2SiO2.B2O3]-[K2O]system (x = 0, 0·1, 0·2, 0·3, 0·4) has been studied. Perovskite titanate was found to be the major phase in all samples investigated. The actual composition of the crystallites developed could not be confirmed on the basis of shifts in the XRD peak positions with changing Pb2+/Sr2+ ratio, because of similar effects due to solid solution and strain resulting from crystal clamping. Comparison of the observed intensities of the perovskite titanate phase with calculated intensities for (Pb1 - xSrx)TiO3 ceramics with the same lead/strontium ratios confirmed the formation of lead strontium titanate solid solution.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"299 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115236324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225001614
M. Anderson, R. Skerratt
Abstract The prospective use of incinerated sewage sludge ash (ISSA) as a partial replacement for traditional brick-making materials has been previously reported. However, variability in the consistency of the raw materials used in commercial brick manufacture can cause serious production problems. Consequently, to gain market confidence for ISSA in this role, it is essential to establish that its quality is not detrimentally affected either by the nature of the sewage sludge being burned, or as a result of the performance of the incineration process itself. Ash sampling was conducted at a large modern commercial sewage sludge incinerator over a six week period, followed by property characterisation and ceramic evaluation. The results confirm that this source of ISSA is satisfactorily consistent in quality over time, thus verifying its potential for use in brick manufacture on a commercial basis. Recommendations for additional research to help ensure widespread acceptance are also discussed.
{"title":"Variability study of incinerated sewage sludge ash in relation to future use in ceramic brick manufacture","authors":"M. Anderson, R. Skerratt","doi":"10.1179/096797803225001614","DOIUrl":"https://doi.org/10.1179/096797803225001614","url":null,"abstract":"Abstract The prospective use of incinerated sewage sludge ash (ISSA) as a partial replacement for traditional brick-making materials has been previously reported. However, variability in the consistency of the raw materials used in commercial brick manufacture can cause serious production problems. Consequently, to gain market confidence for ISSA in this role, it is essential to establish that its quality is not detrimentally affected either by the nature of the sewage sludge being burned, or as a result of the performance of the incineration process itself. Ash sampling was conducted at a large modern commercial sewage sludge incinerator over a six week period, followed by property characterisation and ceramic evaluation. The results confirm that this source of ISSA is satisfactorily consistent in quality over time, thus verifying its potential for use in brick manufacture on a commercial basis. Recommendations for additional research to help ensure widespread acceptance are also discussed.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126633264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225004918
G. West, G. Diamond, N. Dajda, Mark E. Smith, M. Lewis
Abstract A sol-gel polymerisation/pyrolysis route has been used to produce hybrid organic-inorganic membranes. This route involved the copolymerisation of two organo-functional precursors, methyltrimethoxysilane and phenyltrimethoxysilane or diphenyldimethoxysilane. The thermal stability and structural evolution with temperature of the resulting xerogels were investigated using multinuclear solid state NMR (13C and 29Si), thermal analysis (TGA and DTA), and FTIR. It is shown that during pyrolysis the methyl ligand is replaced with hydroxyl groups, some of which condense into siloxane linkages. The retained hydroxyl groups are thought to provide adsorption sites throughout the material onto which polar gas molecules (such as CO2) can adsorb, and diffuse under a pressure gradient. This hypothesis is supported by the results of gas permeation trials on the membranes, and thus a direct link is established between membrane performance and material structure.
{"title":"Structural characterisation of organosiloxane membranes","authors":"G. West, G. Diamond, N. Dajda, Mark E. Smith, M. Lewis","doi":"10.1179/096797803225004918","DOIUrl":"https://doi.org/10.1179/096797803225004918","url":null,"abstract":"Abstract A sol-gel polymerisation/pyrolysis route has been used to produce hybrid organic-inorganic membranes. This route involved the copolymerisation of two organo-functional precursors, methyltrimethoxysilane and phenyltrimethoxysilane or diphenyldimethoxysilane. The thermal stability and structural evolution with temperature of the resulting xerogels were investigated using multinuclear solid state NMR (13C and 29Si), thermal analysis (TGA and DTA), and FTIR. It is shown that during pyrolysis the methyl ligand is replaced with hydroxyl groups, some of which condense into siloxane linkages. The retained hydroxyl groups are thought to provide adsorption sites throughout the material onto which polar gas molecules (such as CO2) can adsorb, and diffuse under a pressure gradient. This hypothesis is supported by the results of gas permeation trials on the membranes, and thus a direct link is established between membrane performance and material structure.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115804859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803765763025
Delegates were welcomed to the workshop by the Head of the Department of Materials and Medical Sciences at Cranfield, Professor Cliff Friend, and by the founder and President of the ABW Council, Susan Essien Etok. The morning session began with a comprehensive description of conventional and new systems for dental restorative materials by Professor Peter Marquis (University of Birmingham). He argued convincingly that finding alternatives to metallic amalgams is a high technology challenge and described the potential benefits of newly developed nanoparticulates in providing the material quality and aesthetics required. Professor Andrew Lloyd (Universit y of Brighton) then presented an intriguing method for enhancing osseointegration through exploitation of part of the natural mineralisation process. In particular the role of calcium-binding phospholipids within matrix vesicles was described and Professor Lloyd showed how such lipids can, in vitro, selfassemble into three-dimensional gels that may provide a suitable environment for rapid calcification. Fabrication routes to produce apatite coatings were expertly discussed by Dr David Grant (Universit y of Nottingham). In particular, coatings formed by plasma spraying and laser ablation were compared with respect to their chemistry, surface topography and cell interaction. Dr Grant emphasised the need to apply absorption corrections in diffraction measurements of crystallinit y and pointed out the lack of any ASTM methodology in this respect. Subsequently, Dr Jonathon Knowles provided a persuasive description of the use of phosphate based glasses as biomaterials, and explained how the solubility of such materials can be significantly modified Hosted by Cranfield University (Shrivenham campus, UK) on 17 March 2003, this workshop was the inaugural event in what is intended to become a series of such meetings. The workshop, designed particularly to introduce new researchers to more established workers in the field and to present research in new and emerging areas, attracted more than 80 delegates from as far away as Spain and Belgium. 1st Annual Biomaterials Workshop
{"title":"1st Annual Biomaterials Workshop","authors":"","doi":"10.1179/096797803765763025","DOIUrl":"https://doi.org/10.1179/096797803765763025","url":null,"abstract":"Delegates were welcomed to the workshop by the Head of the Department of Materials and Medical Sciences at Cranfield, Professor Cliff Friend, and by the founder and President of the ABW Council, Susan Essien Etok. The morning session began with a comprehensive description of conventional and new systems for dental restorative materials by Professor Peter Marquis (University of Birmingham). He argued convincingly that finding alternatives to metallic amalgams is a high technology challenge and described the potential benefits of newly developed nanoparticulates in providing the material quality and aesthetics required. Professor Andrew Lloyd (Universit y of Brighton) then presented an intriguing method for enhancing osseointegration through exploitation of part of the natural mineralisation process. In particular the role of calcium-binding phospholipids within matrix vesicles was described and Professor Lloyd showed how such lipids can, in vitro, selfassemble into three-dimensional gels that may provide a suitable environment for rapid calcification. Fabrication routes to produce apatite coatings were expertly discussed by Dr David Grant (Universit y of Nottingham). In particular, coatings formed by plasma spraying and laser ablation were compared with respect to their chemistry, surface topography and cell interaction. Dr Grant emphasised the need to apply absorption corrections in diffraction measurements of crystallinit y and pointed out the lack of any ASTM methodology in this respect. Subsequently, Dr Jonathon Knowles provided a persuasive description of the use of phosphate based glasses as biomaterials, and explained how the solubility of such materials can be significantly modified Hosted by Cranfield University (Shrivenham campus, UK) on 17 March 2003, this workshop was the inaugural event in what is intended to become a series of such meetings. The workshop, designed particularly to introduce new researchers to more established workers in the field and to present research in new and emerging areas, attracted more than 80 delegates from as far away as Spain and Belgium. 1st Annual Biomaterials Workshop","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114745866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225004936
M. Zawrah
Abstract Seven mixes of mullite-spinel composites composed of 100:0, 80:20, 60:40, 50:50, 40:60, 20:80, and 0:100 wt-% of presynthesised mullite and magnesium aluminate (MA) spinel were prepared and fired up to 1550°C for 2 h. The phase compositions of the fired mixes were investigated using X-ray diffractometry. The physical, mechanical, and refractory properties of the fired composite batches were determined according to DIN standard specifications. The two mixes containing 40 and 20 wt-% mullite with 60 and 80 wt-% MA spinel were considered as optimum mixes, since they combined better physical, mechanical, and refractory properties than the other compositions. Additions of 2 wt-%Cr2O3 to both mixes resulted in further improvements in physical and mechanical properties after firing at 1550°C owing to its solid solution in mullite and spinel.
{"title":"Effect of Cr2O3 on sinterability and properties of mullite-spinel composites","authors":"M. Zawrah","doi":"10.1179/096797803225004936","DOIUrl":"https://doi.org/10.1179/096797803225004936","url":null,"abstract":"Abstract Seven mixes of mullite-spinel composites composed of 100:0, 80:20, 60:40, 50:50, 40:60, 20:80, and 0:100 wt-% of presynthesised mullite and magnesium aluminate (MA) spinel were prepared and fired up to 1550°C for 2 h. The phase compositions of the fired mixes were investigated using X-ray diffractometry. The physical, mechanical, and refractory properties of the fired composite batches were determined according to DIN standard specifications. The two mixes containing 40 and 20 wt-% mullite with 60 and 80 wt-% MA spinel were considered as optimum mixes, since they combined better physical, mechanical, and refractory properties than the other compositions. Additions of 2 wt-%Cr2O3 to both mixes resulted in further improvements in physical and mechanical properties after firing at 1550°C owing to its solid solution in mullite and spinel.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129442521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225004927
Z. Yu, Yi Huang, Caams Wang, X. Cui, S. Ouyang
Abstract A novel gel tape casting process has been developed by introducing sodium alginate into a conventional aqueous tape casting slurry. The process makes use of a binder system consisting of 1 wt-% sodium alginate and 20 vol.-% styrene acrylic latex to prepare the tape casting slurry. Sodium alginate can react with calcium iodate to form a three-dimensional network at room temperature, and with the ceramic particles held in this three-dimensional network, the slurry can be consolidated to form green tapes. This allows the need for the special drying procedure that is usually a critical step in tape casting to be avoided. Styrene acrylic latex was used to improve the flexibility of the green tapes. Compared with tapes obtained by conventional aqueous tape casting, more homogeneous microstructure was obtained by this process.
{"title":"Application of sodium alginate gelation to aqueous tape casting","authors":"Z. Yu, Yi Huang, Caams Wang, X. Cui, S. Ouyang","doi":"10.1179/096797803225004927","DOIUrl":"https://doi.org/10.1179/096797803225004927","url":null,"abstract":"Abstract A novel gel tape casting process has been developed by introducing sodium alginate into a conventional aqueous tape casting slurry. The process makes use of a binder system consisting of 1 wt-% sodium alginate and 20 vol.-% styrene acrylic latex to prepare the tape casting slurry. Sodium alginate can react with calcium iodate to form a three-dimensional network at room temperature, and with the ceramic particles held in this three-dimensional network, the slurry can be consolidated to form green tapes. This allows the need for the special drying procedure that is usually a critical step in tape casting to be avoided. Styrene acrylic latex was used to improve the flexibility of the green tapes. Compared with tapes obtained by conventional aqueous tape casting, more homogeneous microstructure was obtained by this process.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126925368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225001623
Hyungsun Kim, J. H. Kim, K. Ikeda
Abstract To understand freezing in roofing tiles at low temperature with the aim of preventing frost damage, the effects of microstructure, pore size, porosity, and pore distribution on flexural strength at low temperature were studied. Strength was determined by four point bending tests at room temperature and low temperatures of -10, -30, and -50°C. Porosity and pore size distribution affected low temperature strength, and freezing time and temperature showed a close correlation with strength. A relationship between porosity P and flexural strength S at low temperature ( -10, -30°C) was found, given by S = S0 exp (-bP), where S0 = 49-58 MPa and b = 4·7-7·4. With a decreasing frozen temperature in the range -10 to -50°C, flexural strength increased, and tiles with lower porosity showed higher strength.
{"title":"Effect of pores on flexural strength of roofing tiles at low temperature","authors":"Hyungsun Kim, J. H. Kim, K. Ikeda","doi":"10.1179/096797803225001623","DOIUrl":"https://doi.org/10.1179/096797803225001623","url":null,"abstract":"Abstract To understand freezing in roofing tiles at low temperature with the aim of preventing frost damage, the effects of microstructure, pore size, porosity, and pore distribution on flexural strength at low temperature were studied. Strength was determined by four point bending tests at room temperature and low temperatures of -10, -30, and -50°C. Porosity and pore size distribution affected low temperature strength, and freezing time and temperature showed a close correlation with strength. A relationship between porosity P and flexural strength S at low temperature ( -10, -30°C) was found, given by S = S0 exp (-bP), where S0 = 49-58 MPa and b = 4·7-7·4. With a decreasing frozen temperature in the range -10 to -50°C, flexural strength increased, and tiles with lower porosity showed higher strength.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124289323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-06-01DOI: 10.1179/096797803225001641
B. O. Aduda, A. Boccaccini
Abstract A review has been undertaken of recently published data on ultrasonic velocity-porosity for a variety of porous ceramic materials, including information on pore structure. These experimental data have been compared with data calculated using a spheroidal pore model incorporating information on pore volume fraction, shape, and orientation. Good agreement is obtained between experimental and calculated values, especially when fractional porosity is less than about 0·25, even when a single 'effective' pore shape is employed in the calculation. The agreement improves if a different pore shape for each porosity level (point by point analysis) is used. The predictive ability of the spheroidal pore model is thus demonstrated.
{"title":"Velocity of elastic waves in porous ceramic materials: influence of pore structure","authors":"B. O. Aduda, A. Boccaccini","doi":"10.1179/096797803225001641","DOIUrl":"https://doi.org/10.1179/096797803225001641","url":null,"abstract":"Abstract A review has been undertaken of recently published data on ultrasonic velocity-porosity for a variety of porous ceramic materials, including information on pore structure. These experimental data have been compared with data calculated using a spheroidal pore model incorporating information on pore volume fraction, shape, and orientation. Good agreement is obtained between experimental and calculated values, especially when fractional porosity is less than about 0·25, even when a single 'effective' pore shape is employed in the calculation. The agreement improves if a different pore shape for each porosity level (point by point analysis) is used. The predictive ability of the spheroidal pore model is thus demonstrated.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115428726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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