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High-hardness wear-resistant piston pin and preparation method thereof

A piston pin, high hardness technology, applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problems of low material utilization rate, large internal stress of the coating, low service life, etc., to improve the bonding performance and high bonding strength. , the effect of good compatibility

Active Publication Date: 2021-04-16
湖南英捷高科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]1. The process is complicated, the utilization rate of materials is low, and the service life is low
[0005]2. The thickness of carburized layer or nitrided layer is not easy to control
[0006]3. Poor performance stability
[0008] Co-Cr-W alloys have high hardness and stability, and are often prepared on the metal surface by laser cladding, plasma cladding, thermal spraying and other technologies Co-Cr-W alloy coating, but due to the large amount of heat output in the preparation process, the substrate is deformed, the internal stress of the coating is large, and micro-cracks are generated, and the coating peels off during the use of parts, resulting in product failure.

Method used

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  • High-hardness wear-resistant piston pin and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A high-hardness wear-resistant piston pin and its preparation technology, the process is as follows:

[0055] A. Raw material preparation: the base material is 31CrMoV9 alloy powder prepared by gas atomization, the average particle size is 14.8μm, and the chemical composition is: C: 0.27~0.34wt%, Cr: 2.30~2.70wt%, Mo: 0.15~0.25wt% , V: 0.10 to 0.20 wt%, Fe: balance.

[0056] Co-33Cr-18W-1C-0.5B (wt%) alloy powder prepared by gas atomization is selected as the coating layer material, with an average particle size of 13.6 μm.

[0057] Binders A and B: prepared according to the following mass percentages, polyoxymethylene (POM): 85%; polyethylene (PP): 10%; polyolefin elastomer (POE): 3%; BASF 1098 antioxidant: 1%; Stearic acid (SA): 1%.

[0058] B. Preparation of feed: mix binder A and 31CrMoV9 alloy powder according to the volume ratio of 45%:55%, and granulate to make matrix material feed. The mixing temperature is 155°C, and the speed of the mixer is 90r / min, the m...

Embodiment 2

[0064] A high-hardness wear-resistant piston pin and its preparation technology, the process is as follows:

[0065] A. Raw material preparation: the base material is Inconel718 alloy powder prepared by gas atomization, the average particle size is 16.8 μm, and the chemical composition is: C: ≤0.08wt%, Nb: 4.75-5.5wt%, Mo: 2.8-3.3wt%, Cr: 17-21 wt%, Ni: 50-55 wt%, Ti: 0.65-1.15 wt%, Al: 0.2-0.8 wt%, Fe: balance.

[0066] Co-32Cr-16W-1.2C-0.8B (wt%) alloy powder prepared by gas atomization is selected as the coating layer material, with an average particle size of 15.6 μm.

[0067] Binders A and B: prepared according to the following mass percentages, polyoxymethylene (POM): 84%; polyethylene (PP): 11%; polyolefin elastomer (POE): 3%; BASF 1098 antioxidant: 1%; Stearic acid (SA): 1%.

[0068] B. Preparation of feeding material: mixing and granulating binder A and Inconel718 alloy powder according to the volume ratio of 48%: 52% to make matrix material feeding, the mixing temp...

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Abstract

The invention discloses a high-hardness wear-resistant piston pin and a preparation method thereof. The preparation method comprises the following steps of firstly, respectively mixing matrix material powder and Co-Cr-W alloy powder with a binder, and performing granulation to obtain a matrix material feed and a high-hardness wear-resistant coating material feed; then, sequentially injecting the matrix material feed and the Co-Cr-W alloy coating material feed into a mold cavity by using an injection molding technology to obtain a product green body; removing the binder in the green body through catalytic debinding and thermal debinding processes; and finally, performing co-sintering densification to obtain the Co-Cr-W series high-hardness wear-resistant piston pin. The process is simple, the bonding performance of a coating layer and a matrix is good, and the piston pin has the characteristics of high hardness and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of wear-resistant materials, and in particular relates to a high-hardness wear-resistant piston pin and a preparation method thereof. Background technique [0002] In recent years, the engine has been developing towards high power, high load and light weight, and higher requirements have been put forward for the weight, strength and reliability of the piston pin, which requires continuous improvement in structure and materials. Innovation and optimization. The piston pin is inside the cylinder, and forms high-speed motion during operation, with a large inertial force. Especially for high-speed engines, the reciprocating inertial force can reach more than 3000 times its own weight. The piston pin transmits load and motion during the working process, and the surface of the piston pin is worn. It is the main cause of piston pin failure. [0003] The traditional piston pin is made of steel, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F1/00B22F3/10B22F3/22F16J1/16
Inventor 余勇李益民胡幼华何浩常智敏王霄
Owner 湖南英捷高科技有限责任公司
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