Manufacturing of WC Alloys by Consolidation of MA Powders Made From W-C-Co or W-C-Fe-Al Powder Mixture

作者：Isonishi Kazuo^*

来源：Steel Research International, 2010, 81(9): 1300-1303.

• Tungsten carbide
• Phase formation
• Densification
• Solid state sintering
• Mechanical alloying
• Vacuum hot pressing
• Binder phase
• Mechanical properties

The manufacturing of WC alloy by mechanical alloying (MA) and pressure sintering was investigated. Especially, this paper focused on the relationship between synthesize of objective phases and densification behavior during the pressure sintering. In-situ WC alloy having a binder phase of Co or FeAl was fabricated. The starting compositions of elemental powders for MA were to be WC with 10 or 20 vol% binder. The powder mixture was mechanical alloyed by using a low-energy ball mill under an Ar atmosphere. After 1800ks milling, the X-ray diffraction profile showed only elemental W phase. At DTA runs, W2C and complex carbides (Co6W6C, Co3W3C and Fe3W3C) were formed with WC after heating up to 1273 K. 1800 ks milled powder was consolidated by using vacuum hot pressing at the temperature of 1373 K. The compact consisted mainly of WC + Co for W-C-Co system and WC + Fe3W3C for W-C-Fe-Al system. Apparently, the densification was enhanced at the phase formation period and then restricted due to the newly formed carbides.

• 出版日期2010-9