Sliding member and production method therefor

A sliding member and manufacturing method technology, applied in the directions of engine components, chemical instruments and methods, lubricating compositions, etc., can solve problems such as inability to reduce friction, and achieve the effects of improving fuel economy, promoting decomposition reaction, and being easy to form.

Active Publication Date: 2020-03-03
TOYOTA MOTOR EAST JAPAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to Patent Document 2, although friction can be reduced, since a spraying material containing a large amount of ceramics is used, the effect of reducing friction cannot be obtained in a lubricating oil environment containing Mo, and the specific structure is different from that of the present application.

Method used

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  • Sliding member and production method therefor
  • Sliding member and production method therefor
  • Sliding member and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (Example 1, Comparative Example 1)

[0042] As Example 1, a disk-shaped test piece made of bearing steel (SUJ2) was prepared, and a metal material containing Ti was used as a thermal spray material to perform atmospheric plasma spraying to form a thermal sprayed film 12 containing Ti. At this time, two types of metal powders are prepared for the thermal spray material, and a plurality of thermal spray films 12 are formed for each thermal spray material. The composition of the first type of metal powder of the thermal spray material was 100 mass % of Ti, and the composition of the second type of metal powder was 90 mass % of Ti, 6 mass % of aluminum (Al), and 4 mass % of vanadium (V). After each thermal spray film 12 is formed, polishing is performed to adjust the surface roughness of each thermal spray film 12 . Surface roughness is represented by the sum of payload roughness (Rk) and initial wear height (Rpk).

[0043] Each of the produced test pieces was subjected t...

Embodiment 2

[0048] As in Example 1, two types of thermal spray materials were used to form thermal spray films 12 on the test pieces, respectively. At this time, the amount of oxygen in the thermal spray film 12 was changed by changing the thermal spray output in five steps. The friction coefficient was examined in the same manner as in Example 1 for each of the produced test pieces. The result that can be obtained is Figure 4 shown in. like Figure 4 As shown, it was found that the smaller the amount of oxygen in the thermal spray coating 12, the lower the friction coefficient tends to be. If the oxygen amount in the thermal spray coating 12 is 10 mass % or less, the friction coefficient can be less than 0.04, which is preferable.

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Abstract

A sliding member capable of improving friction characteristics under an environment of a lubricant containing Mo, and a production method therefor are provided. In a sliding member (10), a sliding portion (11) is formed of a metallic material, and the surface layer part of the sliding portion (11) has a Ti-containing thermally sprayed coating (12) formed by thermally spraying, as a thermal spraying material, a metallic material containing Ti as a composition. The sliding member (10) slides under the environment of the lubricant containing Mo as an additive, in which active Ti exposed on a surface by sliding accelerates decomposition reaction of the additive contained in the lubricant to form a molybdenum disulfide-containing low-friction coating having low friction on the surface of the sliding portion (11).

Description

technical field [0001] The present invention relates to a sliding member having excellent friction characteristics and a method for producing the same. Background technique [0002] In sliding members used in the engine of an automobile, it is required to improve fuel economy by reducing friction. As a method of reducing wear, there have been various reports conventionally. For example, Non-Patent Document 1 describes that by forming an iron-based alloy sprayed coating on the surface of the sliding part, the reduction of friction between the piston ring and the inner surface of the liner, the wear resistance of the cylinder liner and the wear resistance of the cylinder liner can be achieved. Improvement of the fuel economy of the engine. [0003] In addition, in recent years, friction modifiers have been added to engine oil to reduce friction. Conventionally, there is MoDTC (molybdenum dithiocarbamate or molybdenum dialkyldithiocarbamate) as the most frequently used frict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/134F02F1/00
CPCC23C4/06C23C4/134F02F1/004F02F2200/00B32B15/01C10M2201/05C10M2201/062C10M2227/066C10M2219/068C10M169/04F16J9/26C10N2030/06C10N2050/025C23C4/08F02F3/10C10M103/04C10M2201/053C10N2050/08Y10T428/12806
Inventor 小池亮真锅和干神野晃宏
Owner TOYOTA MOTOR EAST JAPAN
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