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High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method

A cemented carbide and high toughness technology, which is applied in the field of preparing high-strength and high-toughness ultra-fine-grained WC-Co cemented carbide materials to achieve high hardness

Active Publication Date: 2008-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has not been reported at home and abroad at present

Method used

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  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method
  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method
  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: First, 0.5 micron WC powder and 0.5 micron Co powder were mixed and ball milled, the ball-to-material ratio was 3:1, the ball milling speed was 150 r / min, the ball milling time was 24 hours, and the ball milling medium was absolute ethanol. The mixed powder after ball milling is dried and put into graphite mold, pressurized and put into vacuum furnace for vacuum pretreatment. The pretreatment temperature is 1300°C, and the holding time is 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are as follows: sintering temperature 1180°C; sintering heating rate 50°C / min; sintering pressure 80MPa; heat preservation for 10min after reaching the sintering temperature. The ultrafine-grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 1 for the microstructure and Table 1 for the material performance parameters).

Embodiment 2

[0015] Example 2: First, 0.8 micron WC powder and 0.8 micron Co powder were mixed and ball milled, the ball-to-material ratio was 1:1, the ball milling speed was 250 r / min, the ball milling time was 24 hours, and the ball milling medium was absolute ethanol. The mixed powder after ball milling is dried and put into graphite mold, pressurized and put into vacuum furnace for vacuum pretreatment. The pretreatment temperature is 1200°C, and the holding time is 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are: sintering temperature 1200°C; sintering heating rate 100°C / min; sintering pressure 60MPa; heat preservation for 10min after reaching the sintering temperature. The ultra-fine-grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 2 for the microstructure and Table 1 for the material performance parameters).

Embodiment 3

[0016] Example 3: First, 1.0 micron WC powder and 1.0 micron Co powder were mixed and ball milled, the ball-to-material ratio was 1:1, the ball milling speed was 250 r / min, the ball milling time was 24 hours, and the ball milling medium was absolute ethanol. The mixed powder after ball milling is dried and put into graphite mold, pressurized and put into vacuum furnace for vacuum pretreatment. The pretreatment temperature is 1300°C, and the holding time is 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are: sintering temperature 1180°C; sintering heating rate 80°C / min; sintering pressure 60MPa; heat preservation for 10min after reaching the sintering temperature. The ultra-fine-grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 3 for the microstructure and Table 1 for the material performance parameters).

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Abstract

A process for preparing ultra-fine grain WC-10Co hard alloy which is high in density and ductility belongs to the field of powder metallurgy. WC-Co hard alloy of the prior art equipment is hard to obtain combination properties of high hardness, high density and high ductility. The steps of the invention includes that WC powder with particle size of 0.5-1.0 micrometers and Co powder with particle size of 0.5-1.0 micrometers are mixed to be ball ground according to the mass ratio, ball milling medium is anhydrous alcohol, the ball milling time is 24 hours, obtained mixed powder after being dried is arranged inside a die for cold-pressing, the mixed powder and the die are put into a vacuum furnace together for vacuum preprocessing, preserving heat for 1 hour with temperature of 1100-1300DEG C, and the mixed powder is put into a SPS device after the preprocessing. The processing parameters of sintering densification are that the final state sintering temperature is 1180-1210DEG C, the heating rate is 50-100DEG C / minute, the sintering pressure is 50-80MPa, and the preserving time is 10 minutes at the final state sintering temperature. Bulk materials prepared by the invention are approximately and completely densified, and the performance indexes of the rigidity, the intensity and the tenacity reach the international advanced level.

Description

technical field [0001] The invention discloses a new method for preparing high-strength and high-toughness ultra-fine-grained WC-Co cemented carbide materials, which belongs to the technical field of new powder metallurgy. Background technique [0002] The traditional coarse-grained WC-Co cemented carbide material is extremely difficult to achieve a high level of hardness, strength and toughness at the same time, so it is mostly used in fields that do not have strict performance requirements and have a large quantity and a wide range. Ultrafine (usually WC grain size less than 0.5 μm) cemented carbide with higher hardness, wear resistance, strength and toughness is widely used in many fields of metal processing industry, electronics industry, medical and urban construction. Such as micro-drills for integrated circuit boards, dot-matrix printing needles, and disc cutters for cutting the leads of printed circuit boards. Only ultra-fine cemented carbide materials can meet the r...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08B22F3/14
Inventor 宋晓艳赵世贤张久兴王明胜
Owner BEIJING UNIV OF TECH
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