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Steel bonded hard alloy and preparing method thereof

A technology of steel-bonded cemented carbide and a manufacturing method, applied in the field of powder metallurgy, can solve the problems that steel-bonded cemented carbide cannot fully meet market requirements, and achieve the effect of improving hardness and toughness

Inactive Publication Date: 2016-12-14
张倩楠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel-bonded cemented carbide with such parameters cannot fully meet the market requirements.

Method used

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  • Steel bonded hard alloy and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 10 kg of 1-micron tungsten carbide powder, 10 kg of 1-micron hydroxyl iron powder, 400 g of liquid paraffin, and 0.2 kg of 1-micron WB(Me), mix the four thoroughly, and place them in the mold with a four-column press Pressed into a columnar shape, dewaxed at 650 degrees and loaded into composite pyrophyllite, and then pressed figure 1 The sintering process line shown is sintered using a six-sided top press. The abscissa in the figure is the time axis, and the ordinate is the qualitative representation of pressure and power. First, raise the pressure line to 70Mpa for 2 minutes, start heating after keeping the pressure for 5 seconds, raise the output current of the heater to 1080 amps in 10 seconds, keep warm for 15 minutes, then slowly increase the current to 1450 amps for 110 seconds, and keep the temperature at 13 The heat supply is stopped within one minute, the power line returns to 0, and then the pressure is released after two minutes, and the pressure line ...

Embodiment 2

[0030] Weigh 10 kg of 1-micron tungsten carbide powder, 10 kg of 1-micron hydroxyl iron powder, 400 g of liquid paraffin, and 0.4 kg of 1-micron WB(Me), mix the four thoroughly, and place them in the mold with a four-column press Press into a columnar shape, put it into composite pyrophyllite after dewaxing at 650 degrees, and use a six-sided top press for sintering. The process is the same as in Example 1. After the pressure is released, take out the steel-bonded cemented carbide test block of the embodiment of the present invention, and test it after quenching and tempering The bending strength of the test block is 3800kg / mm 2 , the compressive strength is 4600kg / mm 2 , hardness HRA93 (corresponding HRC is greater than 70). However, the existing steel-bonded hard alloy has a bending strength of about 1500-1600kg / mm2, a compressive strength of 1600-2000kg / mm2, and a hardness of HRC60-65 (the corresponding HRA is less than 83).

Embodiment 3

[0032] Weigh 10 kg of 0.5 micron tungsten carbide powder, 10 kg of 0.5 micron hydroxy iron powder, 400 g of liquid paraffin, and 0.3 kg of 0.5 micron WB(Me), and mix the four fully, and use a four-column press in the mold Press into a columnar shape, put it into composite pyrophyllite after dewaxing at 650 degrees, and use a six-sided top press for sintering. The process is the same as in Example 1. After the pressure is released, take out the steel-bonded cemented carbide test block of the embodiment of the present invention, and test it after quenching and tempering The bending strength of the test block is 3600kg / mm2, the compressive strength is 4450kg / mm2, and the hardness is HRA93 (the corresponding HRC is greater than 70). However, the existing steel-bonded hard alloy has a bending strength of about 1500-1600kg / mm2, a compressive strength of 1600-2000kg / mm2, and a hardness of HRC60-65 (the corresponding HRA is less than 83).

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Abstract

The invention belongs to powder metallurgy field and discloses a steel bonded hard alloy. The steel bonded hard alloy comprises tungsten carbide powder, iron carbonyl powder and WB (Me) whose weight ratio is 1%-2 % of the tungsten carbide powder and iron carbonyl powder. The invention further discloses a preparing method of the steel bonded hard alloy. The preparing method comprises the following steps that the tungsten carbide powder, the iron carbonyl powder and the WB (Me) whose weight ratio is 1%-2 % of the tungsten carbide powder and the iron carbonyl powder are fully mixed with liquid paraffin to be pressed into a column shape by a four-column pressing machine in a mold and then to be put into composite pyrophyllite after dewaxing is conducted, a six-surface diamond presser is used to conduct temperature rising and pressure rising sintering, and fetching is conducted after decompression. The steel bonded hard alloy is good in hardness and tenacity; the strength of a fished product of the steel bonded hard alloy is 3300-3800 kg / mm2; the compressive strength is 4200-4800 kg / mm2; hardness is HRC 92-93; the steel bonded hard alloy provided by the invention is superior to existing steel bonded hard alloy.

Description

【Technical field】 [0001] The invention belongs to the field of powder metallurgy, in particular to a steel-bonded hard alloy and a manufacturing method thereof. 【Background technique】 [0002] It is estimated that the output of cemented carbide in my country will reach 30,000 tons in 2016, and the total industrial output value will reach about 23 billion yuan. Cemented carbide has high hardness, strength, wear resistance and corrosion resistance, known as "industrial teeth", used to manufacture cutting tools, knives, drilling tools and wear-resistant parts, widely used in military industry, aerospace , mechanical processing, metallurgy, oil drilling, mining tools, electronic communications, construction and other fields, with the development of downstream industries, the market demand for cemented carbide continues to increase. At the same time, the future high-tech weapons and equipment manufacturing, the advancement of cutting-edge science and technology, and the rapid de...

Claims

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Application Information

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IPC IPC(8): C22C29/00C22C1/05
CPCC22C29/00C22C1/051
Inventor 张倩楠
Owner 张倩楠
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