Development of WC-alloy for precision cutting tool by in-situ formation of fine WC and heat resistant binder

本研究以元素粉末为原料，采用机械合金化及真空热压的方法制备WC合金。WC和粘结相是在固结过程中合成的。本文首先讨论了传统的Co粘结剂，然后讨论了FeAl和Fe_3AlC粘结剂提高高温性能的能力。在WC-Co合金的情况下，由于细分散的WC颗粒，压块显示出比商业合金更高的机械性能（在室温和高温下的硬度和弯曲强度）。用于MA的元素粉末的量由具有化学计量化学组成的WC和粘结剂的分数确定。在1100℃的凝固过程中形成Fe_3W_3C和α-Fe。这似乎是缺乏铝含量。硬度、断裂韧性和1000℃以下的抗弯强度与粘结相类型有很强的相关性。在此基础上，进一步探讨了通过增加Al含量来合成FeAl作为粘结相的方法，并对FeAl的进一步研究进行了前景。

In this study, the formation WC-alloy fabricated by mechanical alloying and vacuum hot pressing from elemental powders was investigated. WC and binder phase were synthesized during consolidation process. First of all, conventional Co binder was discussed, and then the ability of FeAl or Fe_3AlC binder was discussed to order to increase the high temperature properties. In the case of WC-Co alloy, compact showed higher mechanical properties (hardness and bending strength at room and high temperature) compared to the commercial alloy due to the fine dispersed WC particle. The amounts of elemental powders for MA were determined from the fraction of WC and binder having stoichiometric chemical composition. On the other hand, Fe_3W_3C and α-Fe were formed during consolidation at 1100℃. It seems to be the lack of Al content. The hardness, fracture toughness and bending strength up to 1000℃ have strong correlation to the type of binder phase. After the further discussion, FeAl was synthesized as a binder phase by increasing Al content, and the further prospect was suggested.