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High-strength impact-fatigue-resistant seat ring powder metallurgy material

A powder metallurgy and impact resistance technology, applied in the field of metal material manufacturing, can solve the problems of poor thermal hardness and wear resistance of parts, affecting a wide range of applications, low density and porosity, etc., to achieve superior impact resistance, strong wear resistance, The effect of improving durability and reliability

Active Publication Date: 2021-04-16
九江天时粉末制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low density and porosity of traditional powder metallurgy materials, the hot hardness and wear resistance of parts are poor, which affects a wide range of applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-strength anti-impact fatigue seat ring powder metallurgy material, the preparation method of which comprises the following steps:

[0020] (1) Take carbon powder, iron powder, high-speed steel powder (W18Cr4V high-speed steel powder, hardness 62HRC before powdering) and copper powder respectively. Steel powder and copper powder pass through 200 mesh sieves respectively, collect sieved iron powder, sieved high-speed steel powder and sieved copper powder; The mass ratio of carbon powder, sieved iron powder, sieved high-speed steel powder and sieved copper powder is 0.5% of carbon powder, 3% of sieved high-speed steel powder, 11% of sieved copper powder, and the rest is sieved iron powder, 100% in total;

[0021] (2) The carbon powder, sieved iron powder, and sieved high-speed steel powder are mixed uniformly to form a mixed powder, and then the mixed powder is pressed into a ring blank sheet with a thickness of 3mm (the quality of the powder is added every time th...

Embodiment 2

[0025] A high-strength anti-impact fatigue seat ring powder metallurgy material, the preparation method of which comprises the following steps:

[0026] (1) Take carbon powder, iron powder, high-speed steel powder (W18Cr4V high-speed steel powder, hardness 62HRC before powdering) and copper powder respectively. Steel powder and copper powder pass through 200 mesh sieves respectively, collect sieved iron powder, sieved high-speed steel powder and sieved copper powder; The mass ratio of carbon powder, sieved iron powder, sieved high-speed steel powder and sieved copper powder is 0.8% of carbon powder, 4% of sieved high-speed steel powder, 17% of sieved copper powder, and the rest is sieved iron powder, 100% in total;

[0027] (2) Mix the carbon powder, sieved iron powder, and sieved high-speed steel powder evenly to form a mixed powder, and then press the mixed powder into a ring-shaped blank sheet with a thickness of 5mm, and the thickness of the sieved copper powder is 3mm r...

Embodiment 3

[0031] A high-strength anti-impact fatigue seat ring powder metallurgy material, the preparation method of which comprises the following steps:

[0032] (1) Take carbon powder, iron powder, high-speed steel powder (W18Cr4V high-speed steel powder, hardness 62HRC before powdering) and copper powder respectively. Steel powder and copper powder pass through 200 mesh sieves respectively, collect sieved iron powder, sieved high-speed steel powder and sieved copper powder; The mass ratio of carbon powder, sieved iron powder, sieved high-speed steel powder and sieved copper powder is 1.0% of carbon powder, 5% of sieved high-speed steel powder, 21% of sieved copper powder, and the rest is sieved iron powder, 100% in total;

[0033] (2) The carbon powder, sieved iron powder, and sieved high-speed steel powder are mixed uniformly to form a mixed powder, and then the mixed powder is pressed into a ring-shaped blank sheet with a thickness of 6mm, and the thickness of the sieved copper po...

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Abstract

The invention discloses a high-strength impact-fatigue-resistant seat ring powder metallurgy material. A preparation method comprises the following steps: (1) respectively taking carbon powder, iron powder, high-speed steel powder and copper powder, drying the carbon powder, respectively screening the iron powder, the high-speed steel powder and the copper powder through a 200-320-mesh screen, and collecting the screened iron powder, the screened high-speed steel powder and the screened copper powder; (2) uniformly mixing the carbon powder, the screened iron powder and the screened high-speed steel powder to form mixed powder, pressing the mixed powder to form blank sheets, and pressing the copper powder to obtain copper sheet blanks; (3) alternately stacking the blank sheets and the copper sheet blanks, and carrying out heating and vacuum sintering in a pressing state to obtain a sintered finished product; and (4) cooling the sintered finished product to minus 200 to minus 120 DEG C for cryogenic treatment for 1-2 hours, then placing the sintered finished product in air till the temperature of the sintered finished product reaches the normal temperature, heating the sintered finished product to the temperature of 500-750 DEG C for tempering treatment, and taking out and air-cooling the sintered finished product to the normal temperature after the treatment is completed so as to obtain the seat ring powder metallurgy material. The seat ring powder metallurgy material prepared by the method is high in strength, high in wear resistance and excellent in impact resistance, and the durability and the reliability of a seat ring are greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to a high-strength impact-fatigue-resistant seat ring powder metallurgy material. Background technique [0002] Engine valves and valve seat rings are in a high-stress, high-temperature and corrosive working environment, and their working environment is very harsh. In order to ensure their working reliability and service life, they must , It is necessary to properly select materials and rationally design parts. The choice of valve seat ring material should be based on the type of fuel used by the engine, the expected operating temperature, the average effective pressure of the engine, the speed and the service life. Engine valve seat materials usually include alloy cast iron, heat-resistant alloy steel, tool steel and powder metallurgy materials. Due to its low density and porosity, traditional powder metallurgy materials have poor hot hardness and wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/10B22F7/02B22F3/10B22F3/24
Inventor 冯友蓬严云飞
Owner 九江天时粉末制品有限公司
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