中南工业大学学报(自然科学版)2001，Vol.32Issue(1)：66-69,4.
纳米晶W-Ni-Fe粉末的流变行为和烧结特性
Rheologic behavior and sintering characteristic of nanocrystal W-Ni-Fe powder
摘要
Abstract
The rheologic behavior of the nanocrystal W-Ni-Fe powder feedstock in MIM process was studied. The nano-crystal W-Ni-Fe powder was prepared by mechanical alloying (MA), and then was mixed with wax-based binder to formthe feedstock. The effects of MA time, powder volumn and temperature on the rheologic behavior of the feedstock werediscussed. The feedstock viscosity and its sensitivity to the shear rate decreased with increasing milling time. Therefore,the flowability and compactability of the feedstock were proved to be good after milling for a long time. With the volumncontent of the powder increasing, the viscosity of the feedstock increased nonlinearly according to the following formula:η=η0 A [1-( φ/φm )]-n ( where n = 0. 68). The viscosity of the MA powder feedstock was influenced a little by the tem-perature and the shear rate, so the injection temperature and rate had little influence on this kind of green parts. The sin-tering characteristics of this MA-prepared W-Ni-Fe powder were also studied. The results showed that milling had led toa high alloy density when sintering below liquid phase temperature, and the sintering rate was accelerated by large crystaldistortion, grain refining and supersaturated sosoloid.关键词
W-Ni-Fe合金/纳米粉/粉末注射成形分类
矿业与冶金引用本文复制引用
范景莲,黄伯云,曲选辉..纳米晶W-Ni-Fe粉末的流变行为和烧结特性[J].中南工业大学学报(自然科学版),2001,32(1):66-69,4.
