摘要
用放电等离子烧结技术将WO3和炭黑的混合粉原位合成为致密的WC块体.研究了合成工艺和配碳量对块体的物相、致密度和显微组织的影响,结果表明:在860℃～1 060℃温度范围内,炭能快速地将WO3还原成W,同时发生碳化反应,温度继续升高发生烧结.含碳量低时,块体中有杂相W或W2C,含碳量合适时,块体的物相为纯WC,致密度达到WC的理论密度,晶粒在500 nm左右.
The mixed powder of WO3 and carbon was in-situ synthesized to get the dense WC bulk by a spark plasma sintering technique. The effects of the synthesis parameters and the carbon contents on the phase composition, the density and microstructure of the bulk have been studied. The results showed that the carbon can rapidly reduce the WO3 to W and directly carbonize it at 860 degrees C similar to 1 060 degrees C, leading to a sintering reaction with the temperature increasing. When the carbon content is low, the W or W2C still existed in the bulk as impurity. But when the carbon content is appropriate, WC existed only and the density of bulk can be near the theoretical density with a grain size of about 500 nm.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期486-488,共3页
Rare Metal Materials and Engineering
基金
北京市教委资助项目(KM200410005006)
