HPHT Crystallization of Diamond on Seed with Use of Carbon Solvents Prepared by Powder Metallurgy Methods

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Superhard Materials Pub Date : 2023-01-17 DOI:10.3103/S1063457622060065

T. V. Kovalenko, V. Yu. Klochok, A. V. Burchenia, S. O. Ivakhnenko, V. V. Lysakovskyi, O. O. Zanevskyi, O. M. Suprun

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Abstract

Thermobaric formation of carbon solvent alloys under high pressures of 4–6 GPa and at temperatures of 1200–1300°C is used to grow structurally perfect diamond single crystals in the region of thermodynamic stability. It is shown that the formation of samples with minimum values of porosity in the range from 2.49 to 4.50% ensures a stable distribution of elements over the growth volume even in the presence of large differences in the density of elements. For comparison, the results of experiments on the formation of solvent alloys by the methods of powder metallurgy and direct isostatic pressing with subsequent sintering and by the methods of hot pressing of powders are given. It is shown that the samples obtained by classical methods have relatively large final porosity values and cannot be used in the future as carbon solvent alloys during directed growth of diamond single crystals at high pressures and temperatures.

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用粉末冶金法制备的碳溶剂在种子上进行金刚石的高温高温结晶

在4 ~ 6 GPa的高压下，在1200 ~ 1300℃的温度下，用热压法生成碳溶剂合金，生长出在热力学稳定范围内结构完美的金刚石单晶。结果表明，即使在元素密度存在较大差异的情况下，孔隙度最小值在2.49 ~ 4.50%范围内的样品的形成也能保证元素在生长体积上的稳定分布。对比了粉末冶金直接等静压后烧结法和粉末热压法制备溶剂合金的实验结果。结果表明，在高压高温下定向生长金刚石单晶过程中，传统方法得到的样品孔隙率较大，不能作为碳溶剂合金使用。

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来源期刊

Journal of Superhard Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

66.70%

发文量

审稿时长

2 months

期刊介绍： Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.