Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 10    October 2016

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Application of pre-alloyed powders for diamond tools by ultrahigh pressure water atomization
Zhi-qiang CHU1,2, Xue-yi GUO1, Dong-hua LIU2, Yan-xian TAN2, Dong LI1, Qing-hua TIAN1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Hunan Research Institute of Metallurgy and Materials, Changsha 410129, China

Abstract:Copper, iron and cobalt based pre-alloyed powders for diamond tools were prepared by ultrahigh pressure water atomization (UPWA) process. Pre-alloyed powders prepared by different processes including UPWA, conventional water atomization (CWA) and elemental metal mechanical mixing (EMMM) were sintered to segments and then compared in mechanical properties, holding force between matrix and diamond, fracture morphology of blank and sintering diamond section containing matrix. The results showed that the pre-alloyed powder prepared by UPWA exhibits the best mechanical properties including the relative density, the hardness and the bending strength of matrix sintered segment. Sintered segments fractography of UPWA pre-alloyed powder indicates mechanical mosaic strength and chemical bonding force between the pre-alloyed powder and the diamond, leading to the great increase in the holding force between matrix and diamond. The mechanical performance and the service life of diamond tools were greatly improved by UPWA pre-alloyed powders.

 

Key words: ultrahigh pressure water atomization; pre-alloyed powders; diamond tools; sintered segments

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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