Abstract

Sintering of powder compacts can lead to an increase in their density, with the neck between the particles growing. Powder sintering diagrams are constructed in the following coordinates: the relative size of the particle radius (the size of the neck between the sintered particles divided by the particle radius) and the homological melting temperature of the material. To construct sintering diagrams, it is necessary to solve a system of pairs of rate equations for the existing sintering mechanisms. The solution gives the equations of the boundaries separating the regions on the graph “relative radius of the particles–homological temperature,” in which the sintering rate by one mechanism is greater than the other. At these boundaries, the two selected sintering mechanisms make equal contributions to the growth rate of the neck between particles. Sintering diagrams of titanium powders of various dispersions were constructed (with an average particle size of 0.1, 1, 5, and 10 μm.). The sintering diagrams show that the dominant mechanisms of the sintering of titanium micro- and nanopowders in the temperature range of 0.6–0.9 of the absolute melting temperature are surface diffusion from the surface and volume diffusion of the substance from the sources at the boundaries of grains.

中文翻译：

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钛粉的烧结图

摘要

粉末压块的烧结会导致其密度增加，而颗粒之间的颈部会增大。粉末烧结图在以下坐标中构建：颗粒半径的相对大小（烧结颗粒之间的颈颈尺寸除以颗粒半径）和材料的均匀熔化温度。为了构造烧结图，有必要为现有的烧结机制求解成对的速率方程组。该解决方案给出了将图上“颗粒的相对半径-均匀温度”上的区域分开的边界方程，其中一种机理的烧结速率大于另一种机理的烧结速率。在这些边界处，两种选定的烧结机制对颗粒之间的颈部生长速率具有同等的贡献。绘制了各种分散体的钛粉的烧结图（平均粒径为0.1、1、5和10μm）。烧结图表明，在绝对熔化温度的0.6–0.9的温度范围内，钛微粉和纳米粉的烧结的主要机理是表面的表面扩散和物质在晶界处从源的体积扩散。 。