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A composite coating material for improving the high temperature self-lubricating wear resistance of ti6al4v alloy and its preparation method

A high-temperature self-lubricating, composite coating technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of difficulty in meeting practical application requirements, limited improvement in wear resistance of Ti6Al4V alloy substrates, etc. The effect of self-lubricating wear resistance and hardness improvement

Active Publication Date: 2020-09-11
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the improvement of the wear resistance of the Ti6Al4V alloy substrate by this method is limited, especially it cannot have excellent wear resistance in a wider temperature range, and it is difficult to meet the needs of practical applications.

Method used

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  • A composite coating material for improving the high temperature self-lubricating wear resistance of ti6al4v alloy and its preparation method
  • A composite coating material for improving the high temperature self-lubricating wear resistance of ti6al4v alloy and its preparation method
  • A composite coating material for improving the high temperature self-lubricating wear resistance of ti6al4v alloy and its preparation method

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preparation example Construction

[0043] The present invention also provides the preparation method of described composite coating material, comprises the steps:

[0044] mixing the alloy powder and the binder, prefabricating on the surface of the Ti6Al4V alloy, drying, and then obtaining the composite coating material through a laser cladding process;

[0045] The alloy powder includes: TiC16-17wt%, WS 2 22~25wt%, the balance is Ni60.

[0046] The output power of the laser cladding is preferably 1.5-2kW, the output rectangular spot of the laser beam is preferably (3-5)mm×(4-6)mm, the scanning speed is preferably 4-6mm / s, and the energy density is preferably 80 ~100J / mm 2 . More preferably, the output power of the laser cladding is 1.8kW, the output rectangular spot of the laser beam is 4mm×5mm, the scanning speed is 5mm / s, and the energy density is 90J / mm 2 . The present invention has no limitation on the mixing method of the alloy powder and the binder, and it is preferably carried out by using a ball m...

Embodiment 1

[0050] 1. 60wt% Ni60 (average particle size 140 μm), 16.8wt% TiC (average particle size 2 μm) and 23.2wt% WS 2 (average particle size 1 μm) was added to a QM-3SP04 ball mill for ball milling for 12 hours, and then dried to obtain alloy powder.

[0051] 2. Mix the above alloy powder with methylcellulose solution, stir until viscous, and then coat the surface of Ti6Al4V alloy with a coating thickness of 1.8mm, and then keep it in a drying oven at 120°C for 2h.

[0052] 3. Use DLS-980.10-3000C semiconductor laser to scan the surface of the preset alloy powder, adjust the output power to 1.8kW, the output rectangular spot of the laser beam is 4mm×5mm, the scanning speed is 5mm / s, and the energy density is 90J / mm 2 , forming a composite coating material on the surface of Ti6Al4V alloy.

Embodiment 2

[0054] 1. 60wt% Ni60 (average particle size 140 μm), 16wt% TiC (average particle size 2 μm) and 24wt% WS 2 (average particle size 1 μm) was added to a QM-3SP04 ball mill for ball milling for 12 hours, and then dried to obtain alloy powder.

[0055] 2. Mix the above alloy powder with methylcellulose solution, stir until viscous, and then coat the surface of Ti6Al4V alloy with a coating thickness of 1.8mm, and then keep it in a drying oven at 120°C for 2h.

[0056] 3. Use DLS-980.10-3000C semiconductor laser to scan the surface of the preset alloy powder, adjust the output power to 1.5kW, the output rectangular spot of the laser beam is 3mm×4mm, the scanning speed is 4mm / s, and the energy density is 80J / mm 2 , forming a composite coating material on the surface of Ti6Al4V alloy.

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Abstract

The invention discloses a composite coating material capable of improving high-temperature self-lubricating and wear-resisting performance of a Ti6Al4V alloy. The composite coating material is prepared from alloy powder through a laser cladding technology; the alloy powder is prepared from the following raw materials in percentage by weight: 16 to 17 percent of TiC, 22 to 25 percent of WS2 and thebalance of Ni60. A preparation method of the composite coating material comprises the following steps: after uniformly mixing the alloy powder and a binding agent, prefabricating on the surface of the Ti6Al4V alloy and drying; then carrying out the laser cladding technology to obtain the composite coating material. According to the composite coating material, the Ni60 is used as a toughening phase, the TiC is used as a reinforcing phase and the WS2 is used as a lubricating phase and the three phases have a very good cooperative effect of improving the wear resistance of a composite coating. An experiment result shows that the average rigidity of the composite coating is improved by one time when being compared with that of the Ti6Al4V alloy, and the composite coating has excellent self-lubricating wear-resisting performance in a temperature range from room temperature to 800 DEG C.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a composite coating material for improving the high-temperature self-lubricating wear resistance of Ti6Al4V alloy and a preparation method thereof. Background technique [0002] Ti6Al4V alloy has the advantages of good corrosion resistance, high specific strength and high temperature resistance, and is widely used in aviation, marine engineering, biomedical and other fields. These occasions usually require Ti6Al4V alloy moving parts (such as forged titanium fans, compressor discs and blades, intermediary brakes, bearing housings, etc.) The friction performance will affect the service life and reliability of the whole system. In view of the low hardness and poor high temperature wear resistance of Ti6Al4V alloy, which limits its application, it is an urgent need for the industry to develop composite coatings with good high temperature wear resistance and friction redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C32/00C22C19/05B22F1/00
CPCB22F1/0003C22C19/058C22C32/0047C22C32/0089C23C24/103
Inventor 刘秀波周仲炎王勉柯金梁珏罗迎社
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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