W-Ni-Fe重合金的注射成形工艺
来源期刊:中国有色金属学报1998年第3期
论文作者:曲选辉 李益民 李志林 黄伯云
文章页码:436 - 440
关键词:金属注射成形; W-Ni-Fe; 重合金; 流变性能
Key words:metal injection molding; heavy alloy; W-Ni-Fe; rheological behavior
摘 要:研究了97W-2Ni-1Fe重合金喂料的流变学行为, 测定了该合金注射成形试样的力学性能和烧结收缩率。结果表明:97W-2Ni-1Fe重合金喂料的流变行为可用假塑性体来描述, 产品的屈服强度达649 MPa, 断裂强度达936 MPa, 延伸率11.4%,硬度为HRC31, 其力学性能优于传统压制/烧结工艺产品, 且烧结收缩基本各向同性, 产品尺寸偏差范围为±0.02 mm。
Abstract: The rheological behavior of 97W-12Ni-1Fe heavy alloy feedstock was studied. The mechanical properties and shrinkage behaviors of samples formed by injection molding were measured. The results show that the f low of the feedstock is essentially pseudoplastic in behavior and the mechanica l properties of MIM alloy are as follows: σb=936 MPa, σ0.2=649 MPa, δ=11.4% and HRC=31, which are compared favorably with those values obtained by conventional press/sinter process. In addition, it is determined that the sintering shrinkage is almost isotropic and the dimension deviation is within ±0.2 mm.