Inorganic Chemicals Industry >
Effect of pre-alloying raw material on property of diamond tools by microwave pressureless sintering
Received date: 2020-06-25
Online published: 2020-12-15
With the Fe60Cu40 pre-alloy powder and corresponding elemental powders as basic raw materials,the FeCu/WC based diamond tool bits were produced by microwave pressureless sintering at 850 ℃.A microwave pressureless sintering schedule was designed by the investigation of heating characteristics for selected metallic powder formula.Scanning electron microscope（SEM）,universal material testing machine and laser Raman spectroscopy were used to compare and study the microstructure information such as morphology of pre-alloy powder and single powder sintered by microwave,and mechanism properties,such as hardness,relative density and transverse fracture strength,were obtained.The results showed that microwave strengthen sintering can reduce the sintering temperature below to 900 ℃,compared with the conventional sintering method,and no graphitization transformation of diamond particles.The Rockwell hardness,relative density and the transverse fracture strength of microwave sintering sample with FeCu/WC based formula sintered at 850 ℃reached 102.7 HRB,98.5% and 1 035 MPa,respectively.The strengthening mechanism of the microwave sintering and the pre-alloying of raw material on matrix was preliminary discussed.The microwave pressureless sintering showed promising application prospects in the produc-tion of pre-alloyed powder diamond bits.
Shenghui Guo , Longtao Hu , Li Yang , Jiyun Gao , Ming Hou . Effect of pre-alloying raw material on property of diamond tools by microwave pressureless sintering[J]. Inorganic Chemicals Industry, 2020 , 52(12) : 23 -28 . DOI: 10.11962/1006-4990.2020-0054
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