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Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating

A self-lubricating coating and composite powder technology, applied in coating, metal material coating process, melt spraying and other directions, to achieve the effect of simple process, high technical content and small equipment investment

Active Publication Date: 2011-09-28
GRIPM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no research and patent reports on high-temperature wear-resistant self-lubricating coating powder materials

Method used

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  • Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating
  • Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating
  • Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating

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Embodiment 1

[0020] The purpose of this invention is to provide a kind of preparation method of composite powder for high temperature wear-resistant self-lubricating coating, it is characterized in that, composite powder composition phase by weight ratio: NiCr-Cr 3 C 2 : 75%, BaF 2 / CaF 2 : 12.5%, Ni: 12.5%, the preparation method is:

[0021] (1) BaF 2 and CaF 2 The powder is mixed according to the weight ratio of 32%: 68%, a total of 1.25kg is mixed, melted in a clean graphite crucible, cooled to form a massive eutectic, and the massive eutectic is crushed and ball milled to prepare a 1 μm powder;

[0022] (2) BaF 2 / CaF 2 Put the eutectic powder and 1.25kg of nickel powder into the autoclave, and reduce the coated nickel layer with high-pressure hydrogen. layer of BaF 2 / CaF 2 Eutectic powder and 7.5kg of 325 mesh NiCr-Cr 3 C 2 The powder is fully mixed and formulated into a spray-dried slurry. The NiCr-Cr 3 C 2 Medium Ni, Cr, Cr 3 C 2 The weight ratio is 4:1:5;

[0023]...

Embodiment 2

[0031] The purpose of this invention is to provide a kind of preparation method of composite powder for high temperature wear-resistant self-lubricating coating, it is characterized in that, composite powder composition phase by weight ratio: NiCr-Cr 3 C 2 : 70%, BaF 2 / CaF 2 : 12.5%, Ni: 17.5%, the preparation method is:

[0032] (1) BaF 2 and CaF 2 The powder is mixed according to the weight ratio of 30%: 70% in a total of 1.25kg, melted in a clean graphite crucible, cooled, and formed into a massive eutectic, and the massive eutectic is crushed and ball milled to prepare a 1 μm powder;

[0033] (2) BaF 2 / CaF 2 Put the eutectic powder and 1.75kg of nickel powder into the autoclave, and reduce the coated nickel layer with high-pressure hydrogen. layer of BaF 2 / CaF 2 Eutectic powder and 7kg of 300 mesh NiCr-Cr 3 C 2 The powder is fully mixed and formulated into a spray-dried slurry. The NiCr-Cr 3 C 2 Medium Ni, Cr, Cr 3 C 2 The weight ratio is 4:1:5;

[0034]...

Embodiment 3

[0039] The purpose of this invention is to provide a kind of preparation method of composite powder for high temperature wear-resistant self-lubricating coating, it is characterized in that, composite powder composition phase by weight ratio: NiCr-Cr 3 C 2 : 72.5%, BaF 2 / CaF 2 : 12.5%, Ni: 15% composition, the preparation method is:

[0040] (1) BaF 2 and CaF 2 The powder is mixed according to the weight ratio of 34%: 66%, a total of 1.25kg is mixed, melted in a clean graphite crucible, cooled, and formed into a massive eutectic, and the massive eutectic is crushed and ball milled to prepare a 1 μm powder;

[0041] (2) BaF 2 / CaF 2 Put the eutectic powder and 1.5kg of nickel powder into the high-pressure reaction kettle, and reduce the coating nickel layer with high-pressure hydrogen. BaF on nickel layer 2 / CaF 2 Eutectic powder and 7.25kg of 275 mesh NiCr-Cr 3 C 2 The powder is fully mixed and formulated into a spray-dried slurry. The NiCr-Cr 3 C 2 Medium Ni, Cr...

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Abstract

The invention discloses a preparation method of composition powder for a high-temperature wear-resisting self-lubricating coating. The composite powder comprises the following component phases in percent by weight: 67 to 80 percent of NiCr-Cr3C2, 10 to 23 percent of BaF2 / CaF2 and 10 to 23 percent of Ni; and the preparation method comprises the following steps of: fusing and crushing the BaF2 and the CaF2 powders, ball-milling to reach the grain size of 1 to 2Mum, reducing and coating a nickel layer by utilizing high-pressure hydrogen, fully mixing with the NiCr-Cr3C2, atomizing, drying and pelleting, and sintering at the high temperature to finally prepare NiCr / Ni-Cr3C2-BaF2 / CaF2 composite powder. The method has simple flow, small device investment and high technical content; and the prepared powder material is particularly suitable for preparing the high-temperature wear-resisting self-lubricating coating in a hypersonic flame spraying way.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing composite powder for high-temperature wear-resistant self-lubricating coatings. Background technique [0002] In the new type of shipboard gas turbines developed in modern times, there is an urgent need for high-performance aeroengines and gas engines with high driving force, low fuel consumption, and high efficiency. It is very urgent to develop high-performance aero-engines, and improving work efficiency is very critical in the design and manufacture of aero-engines and gas turbines. At present, the better sealing method is to use brush seals to improve the working efficiency of compressors. Due to the use of interference fit, the running track that rubs against the brush wire is required to have high bonding strength with the substrate, high temperature resistance (below 700°C), corrosion resistance (corrosion in marine environment), anti-we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04
Inventor 戴赫汪礼敏张景怀王林山杨中元李学锋林锋
Owner GRIPM ADVANCED MATERIALS CO LTD