The thermal conductivity of carbon-bonded carbon fiber insulation in vacuum was determined before and after short duration heat treatments to model the effect of varying degrees of graphitization. Specimens of the insulation were heat-treated for 10, 15 and 20 seconds at 2673, 2873, 3073, and 3273 K. The dimensions and mass of each specimen was recorded before and after heat treatments. The thermal conductivity of the heat treated specimens was measured as a function of temperature up to 2273 K. These data are compared with previously measured specimens heat treated at the same temperatures for 1 minute and one sample heat-treated at 3273 K for 1 h. The thermal conductivity increases with both the heat treatment temperature and time at temperature. The thermal conductivity data has been modeled to obtain equations that predict the thermal conductivity of the insulation as a function of temperature (673 K {le} T {le} 3773 K) and heat treatment conditions of time (0 {le} t {le} 20 s) and temperature (2673 K to 3773 K).
通过测定短时间热处理前后碳键碳纤维保温材料的真空导热系数，模拟不同程度石墨化对保温材料的影响。保温试样分别在2673、2873、3073和3273 K下热处理10、15和20秒。在热处理前后记录每个试样的尺寸和质量。热处理后试样的导热系数随温度变化至2273 K。这些数据与之前测量的在相同温度下热处理1分钟的样品和在3273 K下热处理1小时的样品进行了比较。热导率随着热处理温度和温度下的时间而增加。对热导率数据进行了建模，得到了热导率随温度(673 K {le} T {le} 3773 K)、热处理时间(0 {le} T {le} 20 s)和温度(2673 K ~ 3773 K)的函数方程。
{"title":"Effect of Sub-Minute High Temperature Heat Treatments on the Thermal Conductivity of Carbon-Bonded Carbon Fiber (CBCF) Insulation","authors":"R. Dinwiddie, G. Nelson, C. E. Weaver","doi":"10.2172/216284","DOIUrl":"https://doi.org/10.2172/216284","url":null,"abstract":"The thermal conductivity of carbon-bonded carbon fiber insulation in vacuum was determined before and after short duration heat treatments to model the effect of varying degrees of graphitization. Specimens of the insulation were heat-treated for 10, 15 and 20 seconds at 2673, 2873, 3073, and 3273 K. The dimensions and mass of each specimen was recorded before and after heat treatments. The thermal conductivity of the heat treated specimens was measured as a function of temperature up to 2273 K. These data are compared with previously measured specimens heat treated at the same temperatures for 1 minute and one sample heat-treated at 3273 K for 1 h. The thermal conductivity increases with both the heat treatment temperature and time at temperature. The thermal conductivity data has been modeled to obtain equations that predict the thermal conductivity of the insulation as a function of temperature (673 K {le} T {le} 3773 K) and heat treatment conditions of time (0 {le} t {le} 20 s) and temperature (2673 K to 3773 K).","PeriodicalId":109951,"journal":{"name":"Thermal Conductivity 23","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126118260","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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