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Preparation method for cemented carbide

A technology of cemented carbide and alloy powder, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of insufficient hardness and strength, achieve high hardness and strength, and improve mechanical activity

Inactive Publication Date: 2017-02-15
柳州增程材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of WC-Co alloy can adopt lamination method, sintering and other processes. The WC grains of WC-Co cemented carbide prepared by these processes are continuously distributed, and the alloy with Co phase gradient has a fine grain side with Higher hardness, the coarse-grain side has a certain bending strength; during sintering, the Co phase migrates from the coarse-grain side to the fine-grain side, and its hardness and strength are not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] A kind of preparation method of cemented carbide, it comprises the following steps:

[0025] WC and Co particles are used as raw materials, and the content of Co is 5-10wt%; then the WC particles and Co particles are cleaned separately to remove surface impurities; the cleaned WC particles and Co are crushed into powder particles; The above-mentioned powder particles are mixed uniformly in a mixer and then ground to obtain alloy powder. Put the above-mentioned alloy powder in an extrusion die, and then extrude it through an extruder to obtain a cemented carbide material; It is also affected by the side pressure and friction of the die wall; as the punch moves, the powder in the die is gradually compacted and extruded through the die. In order to prevent metal oxidation, extrusion molding is carried out under a protective atmosphere, and the pressure is 1000-1200MPa, so that a material with high density can be obtained, and the performance distribution is uniform, and t...

Embodiment 1

[0028] Wash 95wt% WC grains and 5wt% Co grains separately to remove surface impurities; grind the cleaned WC grains and Co grains into powders; then mix the above powders in a mixer evenly and grind them to obtain alloy powder; the alloy powder is placed in an extrusion die, and then extruded by an extruder with a pressure of 1000MPa to obtain a cemented carbide material, followed by sintering at a temperature of 280°C for 30s, then sintering at a temperature of 500°C for 60s, and then Sinter at a temperature of 650°C for 30s; then mix the alloy material with distilled water, and the mass ratio of the alloy material to distilled water is 2.5:1, and add 2% metal granulating agent by the mass of the alloy material and stir evenly to prepare a metal powder slurry; The slurry is granulated by a centrifugal spray granulator, wherein the inlet temperature of the dry air of the spray granulator is 250°C, the outlet temperature is 100°C, and the flow rate of the dry air is 100 Nm 3 / h...

Embodiment 2

[0030] Wash 92wt% WC grains and 8wt% Co grains separately to remove surface impurities; grind the cleaned WC grains and Co grains into powders respectively; then mix the above powders in a mixer and grind them to obtain alloy powder; the alloy powder is placed in an extrusion die, and then extruded by an extruder with a pressure of 1100MPa to obtain a cemented carbide material, followed by sintering at a temperature of 300°C for 25s, and then sintering at a temperature of 560°C for 50s, and then Sinter at 680°C for 25s; then mix the alloy material with deionized water, and the mass ratio of the alloy material to deionized water is 2.8:1, add 3% metal granulating agent by weight of the alloy material and stir evenly, and prepare metal powder Slurry; Then the slurry is granulated by a centrifugal spray granulator, wherein the rotating speed of the centrifugal spray granulator is 6000 rpm, the inlet temperature of the dry air of the spray granulator is 300 ° C, the outlet temperat...

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Abstract

The invention relates to a preparation method for cemented carbide. The preparation method comprises the steps that WC particles and Co particles are washed, and surface impurities are removed; the cleaned WC particles and the cleaned Co particles are smashed into powder particles; then the powder particles are evenly mixed in a mixing machine and then ground, and alloy powder is obtained; the alloy powder is placed in an extrusion mold and then subjected to extrusion molding through an extrusion machine, the alloy material is mixed with liquid, an organic binder is added and evenly stirred, and metal powder slurry is prepared; then the slurry is made into powder through a spray granulator; and the powder is subjected to heat treatment. According to the preparation method for the cemented carbide, the impurities on the surface of the metal powder can be removed through a cleaning process, the purity of an alloy prepared through the subsequent processes is improved, then the mechanical activity of the powder can be improved through mixing and grinding, and a good foundation is provided for the close bonding of the alloy; and then the WC-Co alloy powder is subjected to hot pressing sintering and heat treatment, and the cemented carbide material with higher hardness and strength can be obtained.

Description

technical field [0001] The present invention relates to a process for cemented carbide materials. Background technique [0002] The amount of cemented carbide used in mining, coal and oil drilling is very large. Due to technical limitations, these cemented carbide tools for rock drilling have changed little over the years, and these changes are nothing more than controlling the purity of the alloy and the composition of the binder phase. Wait. At present, cemented carbide tools for mining mainly use WC-Co alloy. In general, the alloy composition of percussion drill bits for drilling, coal mining and asphalt cutting is WC and 6-11% Co, and the alloys for different purposes, because some properties are improved, other properties are reduced. For example, high wear-resistant alloys usually have poor toughness, on the contrary, alloys with good toughness have poor wear resistance. Reducing the Co content and increasing the hardness can reduce the wear of the alloy, while incr...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05B22F3/14B22F9/02B22F1/00B22F3/24
CPCC22C1/051C22C29/08B22F3/14B22F3/24B22F9/026B22F2003/248B22F2003/145B22F2999/00B22F2998/10B22F1/14B22F2202/17B22F2009/043B22F3/20B22F1/10
Inventor 李祥明田源李贤良
Owner 柳州增程材料科技有限公司
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