P. V. Andreev, P. D. Drozhilkin, L. S. Alekseeva, K. E. Smetanina, G. V. Scherbak, A. A. Popov, M. S. Boldin
{"title":"Physical and Mechanical Properties of Ceramics Based on Si3N4 of Various Dispersion with 3% Y2O3–Al2O3","authors":"P. V. Andreev, P. D. Drozhilkin, L. S. Alekseeva, K. E. Smetanina, G. V. Scherbak, A. A. Popov, M. S. Boldin","doi":"10.1134/s2075113324020047","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article focuses on the process of producing ceramics based on the commercial Si<sub>3</sub>N<sub>4</sub> powder of various dispersions (<5 μm and <1 μm) by spark plasma sintering (SPS). The powder mixtures of 97 wt % Si<sub>3</sub>N<sub>4</sub> + 3 wt % additive of the Y<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub> composition are synthesized by the Pechini method. The SPS technology is used to obtain ceramic samples of ∅20 mm. The sintering is carried out in a vacuum at a heating rate of 50°C/min and a load of 70 MPa until the end of the shrinkage. The microstructure and phase composition of the ceramic samples are investigated. Mechanical properties are measured: Vickers hardness, Palmquist fracture toughness, and flexural strength according to the B3B (ball-on-three-balls test) method. Tribological tests are also carried out. It is established that the lower the dispersion of the powder mixtures based on Si<sub>3</sub>N<sub>4</sub>, the lower the end temperature of shrinkage. The relative density achieved is 96%. Ceramic materials based on Si<sub>3</sub>N<sub>4</sub> powder with the dispersion of <1 μm are difficult to machine; they have the hardness of 19.0 ± 0.7 GPa and the crack resistance of 5.1 ± 0.4 MPa m<sup>1/2</sup>. The flexural strength of the ceramics evaluated by the B3B method depends on the dispersion of Si<sub>3</sub>N<sub>4</sub> powder; it is more than two times higher for the ceramics based on the commercial Si<sub>3</sub>N<sub>4</sub> powder with the dispersion of <1 μm.</p>","PeriodicalId":586,"journal":{"name":"Inorganic Materials: Applied Research","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials: Applied Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s2075113324020047","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This article focuses on the process of producing ceramics based on the commercial Si3N4 powder of various dispersions (<5 μm and <1 μm) by spark plasma sintering (SPS). The powder mixtures of 97 wt % Si3N4 + 3 wt % additive of the Y2O3–Al2O3 composition are synthesized by the Pechini method. The SPS technology is used to obtain ceramic samples of ∅20 mm. The sintering is carried out in a vacuum at a heating rate of 50°C/min and a load of 70 MPa until the end of the shrinkage. The microstructure and phase composition of the ceramic samples are investigated. Mechanical properties are measured: Vickers hardness, Palmquist fracture toughness, and flexural strength according to the B3B (ball-on-three-balls test) method. Tribological tests are also carried out. It is established that the lower the dispersion of the powder mixtures based on Si3N4, the lower the end temperature of shrinkage. The relative density achieved is 96%. Ceramic materials based on Si3N4 powder with the dispersion of <1 μm are difficult to machine; they have the hardness of 19.0 ± 0.7 GPa and the crack resistance of 5.1 ± 0.4 MPa m1/2. The flexural strength of the ceramics evaluated by the B3B method depends on the dispersion of Si3N4 powder; it is more than two times higher for the ceramics based on the commercial Si3N4 powder with the dispersion of <1 μm.
期刊介绍：
Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.
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