锻压技术

饰用钨基合金粉末的高速压制成形规律试验

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

作者：马春宇袁军平陈湘平

单位：广州番禺职业技术学院

关键词：WC-Ni-Cr3C2-P系合金钨基合金高速压制压制能量高径比质量能量密度

分类号：TG144

出版年,卷(期):页码：2017,42(8):157-164

摘要：

以WC-Ni-Cr3C2-P系合金粉末为研究对象，通过密度测试、SEM断口形貌分析等手段研究了粉末粒度配比、预热处理、压制能量、高径比、质量能量密度等工艺参数对生坯密度、烧结密度、弹性后效、烧结径向收缩率等成形性能指标的影响规律。研究结果表明：粗WC颗粒（2 μm）与细WC颗粒（0.4 μm）相互搭配的WC-Ni-Cr3C2-P系合金粉末具有更好的成形性能；预热处理不能改善该系合金粉末的成形性能；未添加石蜡作为有机成形剂会出现生坯开裂的情况，能保证成形的压制能量范围较窄，但在生坯密度和烧结密度两方面均比添加有机成形剂时更高，实测压制能量为1425 J时，未添加有机成形剂的生坯密度和烧结密度分别达到10.67和13.48 g·cm-3，而添加有机成形剂的生坯密度和烧结密度分别只达到9.99和13.39 g·cm-3；生坯密度随质量能量密度的提高而提高，添加和未添加有机成形剂粉末的质量能量密度的临界点分别为101.79和118.75 J·g-1，质量能量密度超过临界点，并不能进一步提高生坯密度。

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.

基金项目：

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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