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Coating composition with functions of friction resistance and wear resistance

A wear-resistant coating and composition technology, applied in coatings and other directions, can solve the problems of high cost, low friction coefficient, fast failure of laser cladding technology, improve transmission efficiency and service life, high reduction friction coefficient, low friction coefficient, etc. The effect of improving the service life

Inactive Publication Date: 2012-03-21
ENG COLLEGE OF ENG CORPS PLA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

), its manufacturing method is complicated and expensive, and its self-lubricating coating has high requirements on the friction pair environment, and it fails quickly under high contact stress conditions, and it is difficult to meet the requirements of friction reduction and wear resistance under harsh environmental conditions
That is, these coatings cannot meet the two requirements of high wear resistance and low coefficient of friction at the same time.
In addition, there are also related reports on the preparation of composite material surface coatings by laser cladding technology, but laser cladding technology is expensive and requires airtight containers, and the volume of airtight containers is limited, so it cannot be used for some components with complex structures or large volumes. to process

Method used

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  • Coating composition with functions of friction resistance and wear resistance
  • Coating composition with functions of friction resistance and wear resistance
  • Coating composition with functions of friction resistance and wear resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 Preparation of friction-reducing and wear-resistant coating composition

[0026] Preparation of materials:

[0027] (1) Titanium carbide (TiC) powder, particle size 2 μm ~ 4 μm, commercially available, produced by Zhuzhou Jiangtung Boda Hard Surface Materials Co., Ltd. The TiC content is 99.52%, and the balance is free C, O, N, Fe, Al, Na and other impurities.

[0028] (2) Nickel coated calcium fluoride (CaF 2 -Ni) powder: produced by Beijing Shengbo Gaotai Optical Technology Co., Ltd., made of CaF with a particle size of 35 μm to 37 μm 2 The nickel coating treatment is carried out by the nickel oxyhydroxide decomposition method, and the particle size of the product nickel-coated calcium fluoride powder is 75 μm to 128 μm.

[0029] (3) Nickel-coated graphite (graphite-Ni) powder: commercially available, produced by Shanghai Yifan Graphite Co., Ltd., nickel-coated graphite powder with a particle size of 3 μm to 5 μm is treated with nickel hydroxide decomp...

Embodiment 2

[0034] Embodiment 2 Formation of coating

[0035] The above-mentioned coating composition is deposited on the surface of the steel friction member by plasma spraying technology, and the process is as follows:

[0036] (1) First use emery on 45 # The surface of steel (or other carbon steel) friction components is sandblasted, and the surface roughness after sandblasting is Ra=3.5μm~4.5μm.

[0037] (2) Use DH1080 plasma spraying equipment to spray the coating composition of Example 1 on the surface of the friction member, process parameters: current 600A, voltage 30V, spraying distance 100mm, nozzle moving speed 0.01m / s, spraying thickness 350μm~450μm .

[0038] (3) Through grinding, the surface of the sprayed coating of the friction member is processed to the required precision.

[0039] Microstructural analysis of coatings such as figure 1 , the coating structure is dense, and it is firmly combined with the substrate. The microhardness of the coating reaches HV600.6. The ...

Embodiment 3

[0040] Embodiment 3 performance test of coating

[0041] In the test, the GCr15 steel ball is used as the pair of rubbing parts, and the coating of embodiment 2, 45 # Steel, weldox960 high-strength alloy structural steel for friction.

[0042] The test conditions are: room temperature (25°C), relative air humidity of RH60%, dry friction, sliding speed of 0.1m / s, followed by 6N, 8N, 10N, 12N (the corresponding contact stress is 12.7MPa, 38.2MPa, 63.7MPa, 127.4MPa) load test, the friction and wear test results are as follows Figure 2 ~ Figure 4 shown.

[0043] The variation curves of the three friction coefficients with the load are as follows: figure 2 , the coefficient of friction of the coating composition coating of the present invention is in the scope of 0.085~0.14, 45 # The friction coefficient of steel is between 0.32 and 0.38, and the friction coefficient of weldox960 high-strength alloy structural steel imported from Sweden is between 0.26 and 0.37. It can be se...

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Abstract

The invention relates to a coating composition with functions of friction resistance and wear resistance, which is a powdered mixture composed of titanium carbide powder, nickel-coated calcium fluoride powder, nickel-coated graphite powder, yttrium oxide powder and nickel-based alloy powder, the weight ratio of each component is that: 23-25, 13-15, 8-10, 1, 50-55, wherein the mass part of each element in the nickel-based alloy are: 0.8% of C, 15.5 of Cr, 4% of Si, 3.5% of B, 15% of Fe and 61.2% of Ni. The coating composition with functions of friction resistance and wear resistance can be deposited on a frictional pair surface of a member through a plasma spraying mode to form a self lubricating coating, and is capable of greatly reducing the frictional coefficient, raising the wear resistance performance of the frictional pair of the member, solving the problems of friction resistance and wear resistance of a stress mechanical device with dry friction and high contact which is exposed in the adverse environment, and reducing the frictional energy consumption of the machinery.

Description

technical field [0001] The invention relates to a coating composition for self-lubricating coating on the surface of a friction member, in particular to a friction-reducing and wear-resisting coating composition with low friction coefficient and high wear resistance. Background technique [0002] Many large-scale mechanical equipment, such as rollers and guide rails and pin gear pairs of standard steel bridge horizontal push-type erection mechanisms, crawler tracks and support wheels, guide wheels, and driving wheels of crawler vehicle travel mechanisms, ring gears and ring gears of excavator slewing mechanisms Metal friction components such as gears, transmission mechanisms of ball mills, slewing mechanisms of cranes, trolley drag mechanisms for heating furnaces in the metallurgical industry, etc., are often dusty at the construction site, and the friction components included in the equipment need to be exposed to harsh environments. , Working under dry friction conditions,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12
Inventor 谭业发严骏蔡滨徐婷谭华王小龙周春华何龙郝胜强
Owner ENG COLLEGE OF ENG CORPS PLA UNIV OF SCI & TECH
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