Method for partial plasma spraying of NiCrAlY coating on inner wall of aluminum alloy crankcase with boss, and application of method

A local plasma, aluminum alloy technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem of increasing the difficulty of qualified coating, achieve high coating processing yield, meet the operation requirements, good quality The effect of antioxidant properties

Active Publication Date: 2018-12-21
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the thickness of the coating increases, its internal residual stress is more likely to concentrate, and the difficulty of preparing a qualified coating is virtually increased

Method used

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  • Method for partial plasma spraying of NiCrAlY coating on inner wall of aluminum alloy crankcase with boss, and application of method
  • Method for partial plasma spraying of NiCrAlY coating on inner wall of aluminum alloy crankcase with boss, and application of method
  • Method for partial plasma spraying of NiCrAlY coating on inner wall of aluminum alloy crankcase with boss, and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment provides a kind of method for the local plasma spraying NiCrAlY coating on the inner wall of the aluminum alloy casing with the boss, comprising:

[0032] Step 1: Remove dust and oil from the casing surface.

[0033] Step 2: Protect the non-painted parts of the casing with special metal protection tooling, and measure the original inner diameter of the area to be sprayed.

[0034] Step 3: Sand blast the area to be sprayed with 24# zirconium corundum. The sand blasting pressure is 0.35MPa, the sand blasting distance is 130mm, and the sand blasting angle is 40°. After the sand blasting is completed, use compressed air to blow off any remaining sand or dust.

[0035] Step 4: Put the sanded casing into the jig and fix it horizontally on the turntable. Install, adjust and fix the position of the cooling air duct. Use 2 air ducts, one for cooling the area to be sprayed on the inner wall of the casing, and the other for cooling the outer wall of the cas...

Embodiment 2

[0038] The present embodiment provides a kind of method for the local plasma spraying NiCrAlY coating on the inner wall of the aluminum alloy casing with the boss, comprising:

[0039] Step 1: Remove dust and oil from the casing surface.

[0040] Step 2: Protect the non-painted parts of the casing with special metal protection tooling, and measure the original inner diameter of the area to be sprayed.

[0041] Step 3: Sand blast the area to be sprayed with 24# zirconium corundum. The sand blasting pressure is 0.20MPa, the sand blasting distance is 100mm, and the sand blasting angle is 35°. After the sand blasting is completed, use compressed air to blow off any remaining sand or dust.

[0042]Step 4: Put the sanded casing into the jig and fix it horizontally on the turntable. Install, adjust and fix the position of the cooling air duct. Use 2 air ducts, one for cooling the area to be sprayed on the inner wall of the casing, and the other for cooling the outer wall of the casi...

Embodiment 3

[0045] The present embodiment provides a kind of method for the local plasma spraying NiCrAlY coating on the inner wall of the aluminum alloy casing with the boss, comprising:

[0046] Step 1: Remove dust and oil from the casing surface.

[0047] Step 2: Protect the non-painted parts of the casing with special metal protection tooling, and measure the original inner diameter of the area to be sprayed.

[0048] Step 3: Sand blast the area to be sprayed with 24# zirconium corundum. The sand blasting pressure is 0.30MPa, the sand blasting distance is 150mm, and the sand blasting angle is 60°. After the sand blasting is completed, use compressed air to blow off any remaining sand or dust.

[0049] Step 4: Put the sanded casing into the jig and fix it horizontally on the turntable. Install, adjust and fix the position of the cooling air duct. Use 2 air ducts, one for cooling the area to be sprayed on the inner wall of the casing, and the other for cooling the outer wall of the cas...

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Abstract

The invention relates to a method for partial plasma spraying of NiCrAlY coating on inner wall of aluminum alloy crankcase with a boss, and application of the method, and belongs to the technical field of material surface treatment. The method comprises the following steps: performing dust removal and degreasing treatment on the crankcase, protecting a non-spraying area, performing surface sandingroughening treatment on an area to be sprayed, placing the crankcase in a fixture, fixing the fixture on a turntable, and spraying the spraying area with a NiCrAlY coating. During the spraying process, when the temperature of the area to be sprayed exceeds 150 DEG C, the spraying stops; and the spraying continues until the temperature drops below 100 DEG C; and the spraying is repeated until thethickness meets the requirements. The method ensures the temperature control of the spraying process and effectively controls the degree of deformation of the crankcase. The coated crankcase preparedby the invention is assembled on an aeroengine to achieve stable operation, so the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, and in particular to a method and application of a partial plasma spraying NiCrAlY coating on the inner wall of an aluminum alloy casing with a boss. Background technique [0002] The power, thrust and efficiency of an engine are directly related to the tightness between the rotating and stationary parts of the engine. The casing is an important fixed part in the engine, and the inside of the casing shell is usually prepared with protective coatings with properties such as wear resistance, erosion resistance, oxidation resistance and sealing. The casing parts usually have the characteristics of thin wall thickness and poor rigidity, and are prone to deformation and residual stress during the coating preparation process by thermal spraying. Especially for the aluminum alloy case with a large thermal expansion system, a boss on the inner wall, and only a part of the area below t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/073C23C4/134C23C4/02
CPCC23C4/02C23C4/073C23C4/134
Inventor 徐丽萍邓春明牛少鹏陈龙飞宋进兵邓畅光刘敏周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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