一种多晶石墨材料的高温压缩蠕变行为  

The Compression Creep Behavior of a Polycrystalline Graphite at High Temperature

作　　者：骆蓉[1] 乔生儒[1] 杨峥[1] 李贺军[1] 刘应楼[1] 

机构地区：[1]西北工业大学

出　　处：《中国机械工程》1994年第4期15-16,18,共3页China Mechanical Engineering

基　　金：国家自然科学基金;航空基金

摘　　要：在氩气介质中测定一种多晶石墨材料在１９００～２３５０℃范围内的压缩蠕变行为。试验中用红外仪测量温度，温度波动控制在±３℃以内，用最小读数为１μｍ的ＬＶＤＴ测量蠕变变形，实验数据满足式ε＝Ａσｎｘｐ（－Ｑ／ＲＴ），其中ｎ＝１．９８，Ｑ＝１８５ｋＪ／ｍｏｌ。经计算蠕变激活体积为２１．４６ｎｍ３，相当于几分之一个石墨晶粒尺寸范围被激活。在２０５０，２１５０，２２００℃的蠕变摩擦应力分别为４．６２，４．５９，４．４１ＭＰａ。The compression creep tests were investigated on a polycrystalline .graphite material in argon atmosphere under 1 900℃ to 2 350℃. The infrared spectrometer was used to measure temperature the fluctuating of which were estimated to be in ± 3℃ . The variations of creep elongation were monitored by a LVDT which has minimun scale of 1 μm. The data can be described by the equation: ε= Aσexp (- Q/RT), where n = 1. 98, Q = 185kJ/mol. The creep activation volume is 0. 2146 nm3,which corresponds to the activation occuring on one n-th of graphite crystalline size. The creep friction stresses at temperatures of 2 050℃, 2 150℃and 2 200℃are 4. 62 Mpa,4. 59 MPa and 4. 41 Mpa,respectively.

关 键 词：多晶石墨材料 高温蠕变 摩擦应力 

分 类 号：TB330.23[一般工业技术—材料科学与工程]