【作者】 陈勇；

【导师】 刘宗德；

【作者基本信息】 华北电力大学（北京） ， 热能工程， 2010， 硕士

【摘要】 TiC-Ni金属陶瓷作为WC-Co的替代材料,主要应用于切削加工。但由于其脆性大的缺点,限制了其应用范围。到目前为止,有关TiC-Ni金属陶瓷高温力学性能尤其是高温蠕变性能的研究还很少。本文使用CSS—3905型电子蠕变松弛试验机对自蔓延燃烧结合准静压技术合成的TiC-Ni进行了大量的高温拉伸实验和高温蠕变实验。通过蠕变模型拟合出实验曲线,得出了材料在不同温度下的最小蠕变速率、应力指数和激活能。为了研究材料损伤和材料硬度之间的关系,使用显微维氏硬度计测量了TiC-Ni材料在拉伸、蠕变实验前后硬度的变化,实验结果表明材料的硬度变化没有明确的特征。更多还原

【Abstract】 As an alternative material of WC-Co, TiC-Ni cermets is mainly used in machining aero. However the britleness of this material limits its scope of application. So far, there has been only a few study on high temperature mechanical properties especially high-temperature creep properties on TiC-Ni cermets. In this article, the author carried out a large number of high-temperature tensile/creep tests on TiC-Ni materials prepared by SHS-PHIP technology by using the CSS—3905 creep testing machine. Creep models were used to simulate experimental data. Then the minimum creep rates, stress exponents, and activation energy were also calculated. To investigate the relationship between damage and hardness, micro-Vickers hardness tester was used to measure the hardness of TiC-Ni before and after the tensile/creep experiments. Experimental results showed that the changes of hardness during the experiments had no defining characteristics.更多还原