【摘要】 研究了保护性气氛Ar气压力对燃烧合成TiC∶WC =5∶5的单相 (W ,Ti)C碳含量的影响。研究表明 ,在 0 1～ 0 3MPaAr气压力范围内 ,增加Ar气压力 ,可阻碍燃烧坯体的膨胀或裂纹的出现 ,从而提高 (W ,Ti)C中的合成碳含量 ,并有利于其中游离碳含量的控制。当预热温度为 80 0℃、Ar气压力为 0 2和 0 3MPa时 ,(W ,Ti)C中游离碳含量分别为 0 0 6 2 %、0 32 %。以 0 3MPaAr气压力下合成的 (W ,Ti)C粉末与WC及Co粉为原料烧结制备YT15硬质合金时 ,WC在 (W ,Ti)C中有一个继续固溶过程 ;烧结后的合金硬度为92 1HRA、横向断裂强度为 135 1 9MPa更多还原

【Abstract】 The effect of Ar gas pressure on the carbon content of combustion synthesized uniphase (W,Ti)C with the ratio of WC/TiC of 1 was studied.In the range of Ar gas pressure between 0.1～0.3MPa,increasing the pressure can deter the expansion and craze of combustion sample and increase synthesized carbon content,which is helpful to control the free carbon content of the (W,Ti)C.The (W,Ti)C powders with free carbon content of 0 062% and 0 32% were synthesized at preheat temperature of 800℃ under Ar gas pressure of 0 2MPa and 0 3MPa respectively YT15 alloy was fabricated from WC?Co and(W,Ti)C synthesized under 0 3MPa Ar gas pressure.The WC dissolves in(W,Ti)C during sintering process.The hardness of the sintered YT15 alloy was 92 1 HRA and bending strength 1351 9MPa.更多还原