Apparent viscosity of W–Cu powder compacts during sintering
Apparent viscosity of W–Cu powder compacts during sintering
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DOI：
10.1016/j.msea.2004.05.050
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发表时间：
2004-10
期刊：
影响因子：
6.4
通讯作者：
F. Doré;C. L. Martin;C. Allibert
中科院分区：
文献类型：
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作者：
F. Doré;C. L. Martin;C. Allibert
W-Cu （35vol.%）粉末压坯在烧结过程中的表观刚度是通过在顺序加载下用膨胀法测定轴向粘度来表征的。该研究是在含有亚微米尺寸相的复合粉末上进行的，在1020-1100°C的温度范围内，传统的膨胀测量法证明了显著的收缩。当烧结体密度从0.5增加到0.74时，固态时轴向粘度从103增加到13 × 103MPas，液相时轴向粘度从0.5 × 103增加到4 × 103MPas。这些相当低的数值并不表明形成了刚性W粒子网络。在1060 ~ 1100℃范围内，快速收缩、低轴向粘度和显著的微观结构变化支持了通过粘性流动重排的致密化过程。
The apparent rigidity of W–Cu (35vol.%) powder compacts during sintering is characterised from the determination of axial viscosity by dilatometry under sequential loading. The study is carried out on composite powders containing submicron size phases, in the temperature range 1020–1100°C in which a significant shrinkage is evidenced by conventional dilatometry. When the sintering bodies density increases from 0.5 to 0.74dth, the axial viscosity increases from 103to 13 × 103MPas in solid state and from 0.5 × 103to 4 × 103MPas when Cu is liquid. These rather low values do not indicate the formation of a rigid W particle network. From about 1060 to 1100°C, the rapid shrinkage, the low axial viscosity and the significant microstructure change support a densification process by rearrangement by viscous flow.