Transactions of Materials and Heat Treatment

Title：Forming law experiment of tungsten-based alloy powders used for jewelry by high velocity compaction technology

Authors： Ma Chunyu Yuan Junping Chen Xiangping

Unit： Guangzhou Panyu Polytechnic

KeyWords： serial alloy WC-Ni-Cr3C2-P tungsten-based alloy high velocity compaction compaction energy ratio of height to diameter density of mass energy

ClassificationCode：TG144

year,vol(issue):pagenumber：2017,42(8):157-164

Abstract：

For WC-Ni-Cr3C2-P alloy powders, influences of ratio of particle sizes, preheating process, compaction energy, ratio of height to diameter and density of mass energy on billet density, sintered density, springback effect and sintered radial shrinkage were investigated by density test and SEM. The results show that alloy powders WC-Ni-Cr3C2-P consisted of WC（2 μm）and WC（0.4 μm）have better forming properties. However, the preheating does not improve the forming properties of the alloy powders, and the billet appears crack when the paraffin wax is not added as organic forming solvent. It can ensure that the compression energy range of forming is narrower, but it is higher than which is both in the billet density and the sintered density when the organic forming solvent is added. The results show that when the compaction energy is 1425 J, the billet density and the sintered density without organic forming solvent are 10.67 g·cm-3 and 13.48 g·cm-3 respectively, while they increase to 9.99 g·cm-3 and 13.39 g·cm-3 respectively when the organic forming solvent is added. Therefore, the billet density increases with the increasing of density of mass energy. Furthermore, the critical points of the density of mass energy are 101.79 J·g-1 for the powders with paraffin wax and 118.75 J·g-1 for the powders without paraffin wax. When the density of mass energy exceeds the critical point, the billet density can not be improved further.

Funds：

广东省一流高职院校建设计划项目（粤教高函（2016）250号）；广州市属高校科技项目（2012A006）

马春宇（1981-），男，硕士，副教授

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