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W—Ni—Fe纳米晶粉末的流变特性
引用本文:范景莲,黄伯云,等.W—Ni—Fe纳米晶粉末的流变特性[J].稀有金属材料与工程,2001,30(2):127-130.
作者姓名:范景莲  黄伯云
作者单位:范景莲(中南大学长沙 410083)       黄伯云(中南大学长沙 410083)       曲选辉(中南大学长沙 410083)
摘    要:研究了W-Ni-Fe纳米晶粉末的注射成形(MIM)。纳米晶粉末采用机械合金化(MA)的方法制备,然后将这种纳米晶粉末与蜡基粘剂混合以制备出喂料。讨论了MA球磨时间、纳米粉末的体积装载量和实验温度以喂流料流变行为的影响。结果表明,随球磨时间增加,喂料粘度降低,粘度对剪切速率的敏感性也降低,因此,随球磨时间增加,喂料的流动性和成形性变好,随粉末装载量增加,喂料粘度呈非线性增加,喂料粘度与粉末装载量的关系为:η=η0A1-(ΦΦm)]∧-n,其中n=0.68,粉末经球磨后,粘度变化随温度和剪切速率的变化不大。因此,注射温度和注射速度的变化对MTM产品的质量影响不大。

关 键 词:W-Ni-Fe合金  纳米晶粉末  注射成形  流变特性
文章编号:1002-185X(2001)02-0127-04
修稿时间:2000年7月24日

Rheological Behavior of W-Ni-Fe Nanostructured Powder
Fan Jinglian Huang Baiyun Qu Xuanhui.Rheological Behavior of W-Ni-Fe Nanostructured Powder[J].Rare Metal Materials and Engineering,2001,30(2):127-130.
Authors:Fan Jinglian Huang Baiyun Qu Xuanhui
Abstract:The nanocrystalline powder of W-Ni-Fe alloy used for Metal injection Molding(MIM) has been studied. The nanopowder prepared by Mechanical Alloying(MA) was mixed with a wax-based binder to form a feedstock. The effects of MA milling time, nanopowder volume fraction and temperature on the rheological behavior of the feedstock are discussed. With increase of milling time, the viscosity of the feedstock and the sensitivity of viscosity to shear strain rate decrease. Therefore, the fluidity and formalization of this powder feedstock at the condition of long time milling become better. With increase of powder volume fraction, the viscosity of the feedstock has a non-linear increase, which follows the formula: . Here n is equal to 0. 68. The change of viscosity with temperature and shear strain rate is small for the MA powder, so the quality of these MIM products is not strongly effected by the changes of temperature and injection speed.
Keywords:W-Ni-Fe alloy nanopowder metal injection molding
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