A MATHEMATICAL-MODEL FOR GRAVITY-INDUCED DISTORTION DURING LIQUID-PHASE SINTERING

被引：53

作者：

RAMAN, R ^{[1
]}

GERMAN, RM ^{[1
]}

机构：

[1] PENN STATE UNIV,UNIVERSITY PK,PA 16802

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1995年 / 26卷 / 03期

关键词：

D O I：

10.1007/BF02663915

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Liquid-phase-sintered materials consist of interconnected crystalline grains in a homogeneous matrix phase that forms a liquid during sintering. These composites exhibit viscous flow during sintering that allows densification. Gravitational forces give rise to compact distortion when there is a large amount of liquid at a high temperature. This article treats kinetic aspects of distortion during sintering of tungsten heavy alloys (W-Ni-Fe). The mathematical model predicts distortion and highlights the important variables influencing this phenomenon. The results provide guidelines for minimizing distortion due to gravity. Experiments conducted at several different sintering times show reasonably good agreement with theoretical predictions using the liquid-phase viscosity as a single adjustable parameter. Theoretical predictions of the model are crucial to designing microgravity experiments aimed at understanding dimensional stability.

引用

页码：653 / 659

页数：7

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