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Iron-based coating material for heat insulating protection and coating preparation method thereof

A coating, iron-based technology, applied in the field of thermal insulation protective coating materials and their preparation, can solve the problem of no iron-based amorphous/nanocrystalline coating, etc., and achieve good wear resistance, cost reduction, and good thermal expansion matching. sexual effect

Active Publication Date: 2016-05-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After searching, there is currently no patent report on the iron-based alloy powder material involved in the present invention and the use of supersonic flame spraying (HVOF) to prepare iron-based amorphous / nanocrystalline coatings.

Method used

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  • Iron-based coating material for heat insulating protection and coating preparation method thereof
  • Iron-based coating material for heat insulating protection and coating preparation method thereof
  • Iron-based coating material for heat insulating protection and coating preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] The mass percentages of raw materials required for preparing the iron-based alloy powder are as follows: ferroboron: 27%; ferroniobium: 16%; ferrosilicon: 1.5%; pure chromium: 10%; and the balance is pure iron. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow rate: 6.2GPH, oxygen flow rate: 2000SCFH, powder feeding rate: 5r / min, spraying distance: 380mm, powder feeding gas flow rate: 25SCFH.

Embodiment 2

[0044] The mass percentages of the raw materials required to prepare the iron-based alloy powder are as follows: ferroboron: 22%; ferroniobium: 13.5%; ferrosilicon: 3.0%; pure chromium: 12.5%; the balance is pure iron. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow rate: 6.2GPH, oxygen flow rate 2000SCFH, powder feeding rate: 5r / min, spraying distance: 380mm, powder feeding gas flow rate: 25SCFH.

Embodiment 3

[0046] The mass percentages of the raw materials required to prepare the iron-based alloy powder are as follows: ferroboron: 22%; ferroniobium: 13.5%; ferrosilicon: 3.0%; pure chromium: 12.5%; the balance is pure iron. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow: 5.6GPH, oxygen flow: 1800SCFH, powder feeding rate: 4.5r / min, spraying distance: 360mm, powder feeding gas flow: 20SCFH.

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Abstract

The invention discloses an iron-based coating material for heat insulating protection and a coating preparation method thereof and belongs to the technical field of surface coatings. Raw materials selected include alloy blocks and pure metal blocks, and specifically are ferroboron, ferroniobium, ferrosilicon, pure chromium and pure iron; a high-temperature nitrogen gas atomizing method is adopted to prepare alloy powder, and the alloy powder of 20-45 um in degree of sphericity and granularity; a hypersonic flame spraying method is adopted to prepare an iron-based noncrystalline or nanocrystalline coating. The coating prepared by the method has relatively low heat conductivity and can be used for heat insulating protection of heat-end parts of automobile engines.

Description

technical field [0001] The invention belongs to the field of surface coatings, and in particular relates to a heat-insulating protective coating material and a preparation method thereof which can be used for hot-end components in a medium-low temperature (~650°C) environment. Background technique [0002] In recent years, how to further improve the energy utilization rate of traditional internal combustion engines and reduce their pollutant emissions has been one of the hot research issues in the automotive industry. At this stage, more attention is paid to how to improve the working efficiency of the engine, such as the mature development and application of technologies such as in-cylinder direct injection and turbocharging, which have effectively improved the fuel efficiency of the engine. However, in addition to the considerations of wear and corrosion, one of the main problems faced by increasing the combustion temperature is that it approaches or even exceeds the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/067C23C4/129
Inventor 贺定勇王亮周正姚海华王国红吴旭王一鸣钱子颢
Owner BEIJING UNIV OF TECH
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