【摘要】：將同一批超細鎢粉,分成兩組進行配炭,一組不添加抑制劑,另一組添加一定量Cr_3C_2和VC,分別將兩組樣品分成若干小樣,在真空和氫氣氣氛中,采用不同溫度進行碳化,分析不同WC樣品粉末性能,并將1 200℃碳化的WC樣品制備成鈷含量為8%的硬質(zhì)合金,比較合金性能及金相組織的差異。實驗結(jié)果表明:在氫氣氣氛下,鎢粉更易于碳化,碳化速度更快,WC的結(jié)晶更完整;碳化階段添加抑制劑會抑制WC晶粒的長粗,但也抑制了WC晶粒生長的完整性;提高碳化溫度可以改善WC的結(jié)晶完整性,WC的粒度也會隨溫度的升高而增大。氫氣氣氛碳化的WC制備成合金后晶粒度比真空碳化的WC粗,合金晶粒的均勻性更好,異常長粗的晶粒少;在碳化階段添加抑制劑可以更好的抑制合金晶粒的長粗,同時也抑制了WC粉末晶粒結(jié)晶的完整性,從而導(dǎo)致合金在液相燒結(jié)階段晶粒的異常長粗。
[Abstract]:The same group of ultrafine tungsten powder was divided into two groups, one group did not add inhibitor, the other group added a certain amount of Cr_3C_2 and VC, to separate the two groups of samples into several samples respectively. The samples were carbonized in vacuum and hydrogen atmospheres at different temperatures. The powder properties of different WC samples were analyzed, and the cemented carbides with cobalt content of 8% were prepared from WC samples carbonized at 1 200 鈩，

本文編號：2237884