钨基合金增塑粉末挤压成形新技术

Novel Technology for Plasticizing Powder Extrusion Molding of Tungsten Heavy Alloy

摘要:

采用增塑粉末挤压成形新技术，开发了几种适合钨基合金挤压成形用粘结剂，研究几种配方粘结剂的相容性及挤压、脱脂特性。通过热力学计算和热分析，以及扫描电镜和偏光显微镜观察，发现粘结剂各组元分子间具有较好的相容性。通过优化喂料制备、挤压工艺，分别在60和75 ℃制备出直径达24 mm的大长径比钨基合金棒材。综合采用溶剂-热两步脱脂工艺，实现Ф24 mm挤压棒坯的快速无缺陷脱脂

Abstract:

Adopting a novel technology for plasticizing powder extrusion molding (PEM), some types of novel binder for PEM of tungsten heavy alloy has been developed, and the compatibility, extruding and debinding characteristics of the binders have been studied. The thermodynamic calculation and thermal analysis, and the observation of SEM and polarization microscope were used to certify binder ingredient compatibility. The large aspect ratio tungsten alloy bars with diameters up to 24 mm have used manufactured at 60 ℃ and 75 ℃ respectively by optimizing the preparation technology of feedstock and extrusion process. By adopting the solvent-thermal debinding method the fast extruded bars with 24 mm in diameter and without defect debinding have been obtained