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Heat insulation piston and preparation method

A technology of piston and alloy, applied in the direction of piston, mechanical equipment, coating, etc., can solve the problems of affecting the piston combustion chamber profile, affecting the thermal efficiency of the engine, uneven coating thickness, etc., to promote the flow of gas in the cylinder and prevent the Effect of gas heating and thermal conductivity reduction

Pending Publication Date: 2022-03-01
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing pistons are treated with thermal insulation coating, and the spraying powder is mostly zirconia, yttria-stabilized zirconia, and its heat capacity is relatively high
In addition, the top surface of the piston is fully coated, the cost is high, the process is difficult to control, the thickness of the coating is uneven, and it is difficult to process, which affects the shape of the piston combustion chamber, affects the combustion efficiency, and further affects the thermal efficiency of the engine.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Use corundum powder or quartz sand to roughen the top surface of the steel piston by sand blasting to increase the bonding strength between the bonding layer and the substrate. Sandblasting process parameters: the particle size of the sandblasting abrasive is 80 mesh, the sandblasting pressure is 0.4MPa, the sandblasting distance is 100mm, the sandblasting time is 10s, the sandblasting angle is 75°, and the roughness after sandblasting is 2.5μm.

[0034] (2) The rare earth metal / alloy modified bonding layer is sprayed on the top surface of the piston by plasma spraying method: the rare earth metal / alloy modified bonding layer is a rare earth metal / alloy modified NiCoCrAlY layer, a rare earth metal / alloy modified NiCrAlY layer layer or rare earth metal / alloy modified NiAlY layer, the rare earth metal / alloy is one or more of Ce, Y, Re, Nd, La, Sm, and the coating thickness is 500µm. Process parameters: The suitable powder particle size is 50µm, the oxygen-fuel gas rat...

Embodiment 2

[0040] (1) Use corundum powder or quartz sand to roughen the top surface of the steel piston by sand blasting to increase the bonding strength between the bonding layer and the substrate. Sandblasting process parameters: the particle size of the sandblasting abrasive is 100 mesh, the sandblasting pressure is 0.5MPa, the sandblasting distance is 110mm, the sandblasting time is 20s, the sandblasting angle is 80°, and the roughness after sandblasting is 3.5μm.

[0041](2) The rare earth metal / alloy modified bonding layer is sprayed on the top surface of the piston by plasma spraying method: the rare earth metal / alloy modified bonding layer is a rare earth metal / alloy modified NiCoCrAlY layer, a rare earth metal / alloy modified NiCrAlY layer layer or rare earth metal / alloy modified NiAlY layer, the rare earth metal / alloy can be one or more of Ce, Y, Re, Nd, La, Sm, and the coating thickness is 100µm. Process parameters: The suitable powder particle size is 70µm, the oxygen-gas rati...

Embodiment 3

[0047] (1) Use corundum powder or quartz sand to roughen the top surface of the steel piston by sand blasting to increase the bonding strength between the bonding layer and the substrate. Sandblasting process parameters: the particle size of the sandblasting abrasive is 120 mesh, the sandblasting pressure is 0.6MPa, the sandblasting distance is 120mm, the sandblasting time is 30s, the sandblasting angle is 90°, and the roughness after sandblasting is 4.5μm.

[0048] (2) The rare earth metal / alloy modified bonding layer is sprayed on the top surface of the piston by plasma spraying method: the rare earth metal / alloy modified bonding layer is a rare earth metal / alloy modified NiCoCrAlY layer, a rare earth metal / alloy modified NiCrAlY layer layer or rare earth metal / alloy modified NiAlY layer, the rare earth metal / alloy can be one or more of Ce, Y, Re, Nd, La, Sm, and the coating thickness is 150µm. Process parameters: the suitable powder particle size is 90µm, oxygen- The gas ra...

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Abstract

The invention relates to the technical field of internal combustion engine pistons, in particular to a heat insulation piston and a preparation method thereof.The edge of the top of the piston is sequentially coated with a metal / alloy modified bonding layer, a metal / alloy modified yttrium oxide coating, a yttrium oxide ceramic coating of a hollow structure and a hole sealing layer; the plasma spraying technology is adopted, the process is adjusted, the coating is sprayed, the porosity is improved, the volume heat capacity of the coating is reduced, and heat insulation of the coating is achieved. The wall surface temperature can be changed according to the gas temperature in the cylinder through a top local coating technology, so that the cooling loss is reduced, and inlet gas heating is prevented; the heat capacity can be reduced by more than 50%, and the heat conductivity is reduced by more than 33%; and gas invasion caused by the action of combustion pressure can be prevented through the material of the hole sealing layer, and meanwhile the strength of the coating can be improved. The piston prepared by the method has the characteristics of low heat capacity and low heat conductivity.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine pistons, and more specifically, to a heat-insulating piston and a preparation method thereof. Background technique [0002] At present, improving thermal efficiency is the primary goal of diesel engine improvement and development, and the first thing to consider in reducing energy consumption is also thermal efficiency. Since the current post-treatment emission reduction technology and turbocharging technology have little impact on it, reducing wall heat loss is still the main way to improve the thermal efficiency of internal combustion engines, so it is necessary to prepare thermal insulation coatings on the combustion chamber wall. [0003] Existing pistons are treated with thermal insulation coating, and the spraying powder materials are mostly zirconia and yttria-stabilized zirconia, which have high heat capacity. In addition, the top surface of the piston is fully coated, ...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/02C23C4/06C23C4/11C23C4/18F02F3/10
CPCC23C4/134C23C4/02C23C4/06C23C4/11C23C4/18F02F3/10
Inventor 谭旭光王志坚陈文淼马飞郭灵燕庞斌窦站成贾春苹曾笑笑
Owner WEICHAI POWER CO LTD