A heat-insulating coating material for the protection of automobile engine hot end parts and its preparation method

A technology of thermal barrier coating and alloy powder, which is applied in coating, metal material coating process, melt spraying and other directions to achieve the effects of low thermal conductivity, simplified preparation process and good thermal expansion matching.

Active Publication Date: 2016-11-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] After searching, there is currently no patent report on the preparation of iron-based amorphous thermal barrier coatings by supersonic flame spraying (HVOF)

Method used

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  • A heat-insulating coating material for the protection of automobile engine hot end parts and its preparation method
  • A heat-insulating coating material for the protection of automobile engine hot end parts and its preparation method
  • A heat-insulating coating material for the protection of automobile engine hot end parts and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The mass percentages of elemental components in Fe-based alloy powder are as follows: Cr: 14.5wt.%; Mo: 25.5wt.%; C: 2.2wt.%; B: 1.7wt.%; Si: 1.5wt.%; Er: 2.0wt.%, Fe balance. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow rate: 24L / h, oxygen flow rate: 2150SCFH, powder feeding rate: 5r / min, spraying distance: 350mm, powder feeding gas flow rate: 12SCFH.

Embodiment 2

[0040] The mass percentages of elemental components in Fe-based alloy powder are as follows: Cr: 14.5wt.%; Mo: 25.5wt.%; C: 2.2wt.%; B: 1.7wt.%; Si: 1.5wt.%; Er: 2.0wt.%, Fe balance. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow rate: 26L / h, oxygen flow rate: 2250SCFH, powder feeding rate: 5r / min, spraying distance: 350mm, powder feeding gas flow rate: 12SCFH.

Embodiment 3

[0042] The mass percentages of element components in Fe-based alloy powder are as follows: Cr: 16.5wt.%; Mo: 21wt.%; C: 3.0wt.%; B: 2.1wt.%; Si: 2.0wt.%; Er: 1.5 wt.%, Fe balance. Preparation of iron-based thermal insulation coating, spraying process parameters: kerosene flow rate: 24L / h, oxygen flow rate: 2150SCFH, powder feeding rate: 5r / min, spraying distance: 350mm, powder feeding gas flow rate: 12SCFH.

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Abstract

The invention relates to a heat-insulating coating material for preventing a hot-end component of an automobile engine, and a preparation method thereof, belonging to the technical field of heat-insulating preventive materials. By selecting high-purity metal and alloy including ferrum, chromium, molybdenum, carbon, silicon, erbium, ferro-boron and the like, the alloy powder with the particle size of 20-43mum can be finally prepared by adopting a high-pressure Ar gas atomization method, the alloy powder comprises the following components in percentage by weight: 5-20% of Cr, 15-30% of Mo, 1-4% of C, 0.5-3% of B, 0.5-2.5% of Si, 0.5-3% of Er, and the balance of Fe and inevitable impurities. A Ferrum-based non-crystal heat-insulating coating is prepared by adopting a hypersonic flame spraying technology, and the prepared coating has relatively lower heat conductivity, and can be used for preventing the hot-end component of the automobile engine.

Description

technical field [0001] The invention belongs to the field of heat insulation protection materials, and in particular relates to an iron-based thermal barrier coating material used for hot end parts of automobile engines and a preparation method thereof. Background technique [0002] Since the 19th century, the automobile industry and related science and technology have achieved rapid development, which not only brought comfortable and convenient living conditions to people, but also represented a relatively high level of technological development in the same period. However, the environmental burden caused by its negative effects has attracted more and more attention from the society. Among them, the CO, hydrocarbons (HC), and NO X And solid dust particles have become one of the important causes of urban air pollution and frequent respiratory diseases among residents, and the consumption of a large amount of non-renewable fuels has also triggered an energy crisis. Under the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129C09D5/46
Inventor 周正贺定勇姚海华王曾洁蒋建敏王智慧王国红赵秋颖
Owner BEIJING UNIV OF TECH
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