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Method for preparing clad material of hard alloy in solidness phase of composite ceramic

A cladding material and cemented carbide technology, which is applied in the field of preparation of cemented carbide cladding materials, can solve the problems of narrow sintering temperature range of cladding materials, high price of metal molybdenum powder, high cost of cladding materials, etc., and achieve the expansion of sintering The temperature range, the process method is simple and practical, and the price and performance are reasonable.

Inactive Publication Date: 2007-10-10
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the high cost of materials
Since the cladding material only has the ceramic hard phase of ternary boride formed by in-situ chemical reaction, to ensure the content of the ceramic hard phase in the cladding material, a large amount of metal molybdenum powder must be added to the raw material. The price of metal molybdenum powder is getting higher and higher, which makes the cost of cladding materials higher
Second, the sintering temperature range of cladding materials is narrow
In the case of only the ceramic hard phase of ternary boride in the cladding material, the ratio of the ceramic hard phase to the eutectic liquid phase produced at high temperature is significantly affected by the sintering temperature, and a small temperature change is It will cause a large change in the ratio of ceramic hard phase to eutectic liquid phase, and it is easy to cause under-burning or over-burning loss of the coating material. Therefore, the firing temperature range of the coating material is small, only within ±3°C Firing within a narrow temperature range of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

solvent

[0037] Weigh the cladding raw materials according to the ratio in Table 1, and prepare slurry additives according to the ratio in Table 2.

[0038] Mix the cladding material and the slurry additive in a ratio of 1:1 by weight, then add it to the ball mill tank, mix and mill it with cemented carbide balls for 48 hours, pass the slurry through a 400-mesh sieve, and then vacuum degassing. Forming slurry.

[0039] A thin layer green body with a thickness of 500 microns is prepared on the steel (Q235) substrate by the air spraying method, and the thickness of the green body layer formed by each pass is 100 microns, and a total of 5 spraying forming operations are carried out; sintering in a vacuum furnace, sintering When the vacuum degree is 1.0×10 -2The heating system of Pa sintering temperature is set as follows: from room temperature to 400°C, the heating rate is 10°C / min; at 400°C, heat preservation is 30 minutes; At 1240°C, the heating rate is 5°C / min; at...

Embodiment 2

plasticizer

[0045] Weigh the cladding raw materials according to the ratio in Table 4, and prepare slurry additives according to the ratio in Table 5.

[0046] Mix the cladding material and the slurry additive in a ratio of 1:0.95 by weight, then add it to the ball mill jar, mix and mill it with cemented carbide balls for 100 hours, pass the slurry through a 400-mesh sieve, and then vacuum degassing, that is, Forming slurry. Spraying and forming on the purified surface of the steel substrate (Q235) by air spraying method, the thickness of the green body layer formed in each pass is 100 microns, and a total of 12 spraying and forming operations are carried out;

[0047] Sintered in a vacuum furnace, the vacuum degree during sintering is 1.0×10 -1 Pa, the temperature rise setting of the sintering temperature is: room temperature ~ 400°C, heating rate 10°C / min; 400°C, heat preservation 30 minutes; At 1210°C, the heating rate is 5°C / min; at 1250°C, keep warm for 30 m...

Embodiment 3

plasticizer

[0053] Weigh the cladding raw materials according to the ratio in Table 7, and prepare slurry additives according to the ratio in Table 8.

[0054] Mix the cladding material and the slurry additive in a ratio of 1:1.1 by weight, then add it to the ball mill tank, mix and mill it with cemented carbide balls for 100 hours, pass the slurry through a 400-mesh sieve, and then vacuum degassing. Forming slurry. Spraying and forming on the purified surface of the steel substrate (Q235) by air spraying method, the thickness of the green body layer formed in each pass is 100 microns, and a total of 12 spraying and forming operations are carried out;

[0055] Sintered in a vacuum furnace, the vacuum degree during sintering is 1.0×10 -3 Pa, the temperature rise setting of the sintering temperature is: room temperature ~ 400°C, heating rate 10°C / min; 400°C, heat preservation 30 minutes; At 1200°C, the heating rate is 5°C / min; at 1200°C, keep warm for 30 minutes; f...

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PUM

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Abstract

This invention discloses a method for preparing hard alloy coating material with composite ceramic as the hard phase. The raw materials comprise: Mo powder 35-55 parts, Fe-B alloy 10-30 parts, graphite powder 0-1.5 parts, Cr powder 0-15 parts, Ni powder 0-10 parts, Cr3C2 powder 0-20 parts, WC powder 0-20 parts, TiC powder 0-10 parts, and Fe powder 0-61 parts. The method comprises: preparing green body of the hard alloy coating material on steel matrix, and sintering in liquid phase. The hard phase of the ternary boride ceramic and added carbide ceramic can widen the sintering temperature range, and improve the wear resistance of the hard alloy coating material.

Description

technical field [0001] The invention relates to a method for preparing a cemented carbide cladding material of a composite ceramic hard phase, in particular to a cemented carbide cladding material of a composite ceramic hard phase prepared on the surface of a steel substrate by a liquid phase sintering process Methods. Background technique [0002] The continuous development of high technology and industrial modernization has higher and higher requirements on the material properties of mechanical equipment parts, such as to withstand unprecedented working conditions such as high speed, high temperature, high pressure, heavy load, and corrosive media. The damage of parts often starts from the surface, and the local damage of the surface leads to the failure of the whole part. The physical and chemical properties of the steel surface play a decisive role in many of its important performances, such as hardness, wear resistance, corrosion resistance, heat resistance and oxidati...

Claims

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Application Information

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IPC IPC(8): C04B35/64C04B35/622C04B35/515C04B35/58C04B35/56C23D5/02C23D3/00
Inventor 刘福田陈启祥孙卫华李文虎赵正黄巍岭李兆前
Owner UNIV OF JINAN