Dilatometric analysis on the sintering behavior of nanocrystalline W-Cu prepared by mechanical alloying
Dilatometric analysis on the sintering behavior of nanocrystalline W-Cu prepared by mechanical alloying
复制标题
DOI：
10.1016/s0925-8388(01)01805-9
复制
发表时间：
2002-03-14
影响因子：
6.2
通讯作者：
Moon, IH
中科院分区：
文献类型：
--
作者：
Ryu, SS;Kim, YD;Moon, IH
与传统的W-Cu粉末相比，纳米晶W-Cu粉末在固相烧结温度下的烧结性能得到显著提高。为了阐明机械合金化法制备纳米晶W-Cu粉末的烧结强化行为，采用XRD分析了不同升温速率下纳米晶W-Cu粉末在加热阶段的烧结行为。纳米晶W-Cu粉末的烧结过程具有两个阶段的致密化特征，收缩率曲线出现双峰。第一个峰出现的温度远低于Cu的熔点，并显着依赖于加热速率。基于XRD数据和显微组织观察，纳米晶W-Cu粉末固相烧结增强的可能机制是粉末内部烧结和粉末颗粒间烧结的耦合作用。(C)2002 Elsevier Science B.V.保留所有权利。
Unlike conventional W-Cu powder, the sintering of nanocrystalline W-Cu powder was significantly enhanced at solid phase sintering temperature. In the present study, in order to clarify this enhanced sintering behavior of nanocrystalline W-Cu powder prepared by mechanical alloying, the sintering behavior during heating stage was analyzed by dilatometry with various heating rates. The sintering of the nanocrystalline W-Cu powder was characterized by the densification of two stages, having two peaks in shrinkage rate curves. The temperature at which the first peak appeared was well below the Cu melting point and significantly dependent on the heating rate. On the basis of dilatometric data and microstructural observation, the possible mechanism for the enhanced sintering of the nanocrystalline W-Cu powder in the solid phase was attributable to the coupling effect of the sintering occurring inside as-milled powder and the sintering between powder particles. (C) 2002 Elsevier Science B.V. All rights reserved.