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Silicon nitride ceramic connecting rod bushing and preparation method thereof

A technology of silicon nitride ceramics and connecting rod bushings, which is applied in the field of engine parts connecting rod bushings and its preparation, can solve the problems of no connecting rod bushings, etc., and achieve small gap changes, poor compatibility, and oxidation resistance Good results

Inactive Publication Date: 2009-12-09
尹衍利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon nitride ceramic material has good performances such as high temperature resistance, corrosion resistance, wear resistance, insulation, absolute magnetism and self-lubrication, but its proportion and preparation method need to be strictly controlled. At present, it has been widely used in the production of bearings in China, but There is no report on the connecting rod bushing, and there is no report on the preparation method of the connecting rod bushing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) First prepare β-Si 3 N 4 Ceramic powder: 1000g of α-Si 3 N 4 The ceramic powder is put into a ball milling tank, with silicon nitride balls as the ball milling medium and absolute ethanol as the mixed medium, according to the α-Si 3 N 4 The weight ratio of ceramic powder, silicon nitride grinding balls and absolute ethanol is 1:1.8:2. Weigh 1800 grams of silicon nitride grinding balls, 2000 grams of absolute ethanol, and mix ball milling for 30 hours to obtain a slurry Dry the powder in a vacuum drying oven for 4 hours, put the powder into a graphite crucible, keep it in a nitrogen atmosphere at 1550°C for 4 hours, then grind the powder, and pass through a 200-mesh sieve to obtain β-Si 3 N 4 Powder;

[0015] (2) Mixing: according to α-Si 3 N 4 Ceramic powder 30%, β-Si 3 N 4 The proportion of ceramic powder 10%, Si powder 60%, weigh α-Si 3 N 4 Ceramic powder 300g, β-Si 3 N 4 100 grams of ceramic powder, 600 grams of Si powder; in 300 grams of α-Si 3 N ...

Embodiment 2

[0021] (1) First prepare β-Si 3 N 4 Ceramic powder: 1000g of α-Si 3 N 4 The ceramic powder is put into a ball milling pot, with silicon nitride balls as the ball milling medium, acetone as the mixed medium, and according to the α-Si 3 N 4 The weight ratio of ceramic powder, silicon nitride grinding balls and acetone is 1:2:2.5. Weigh 1000 grams of mixed powder, 2000 grams of silicon nitride grinding balls, and 2500 grams of acetone. After mixing and ball milling for 25 hours, the obtained slurry Dry the powder in a vacuum oven for 5 hours, put the powder into a graphite crucible, and keep it warm at 1650°C for 3 hours in a nitrogen atmosphere, then grind the powder and pass it through a 200-mesh sieve to obtain β-Si 3 N 4 ceramic powder;

[0022] (2) Mixing: according to α-Si 3 N 4 Ceramic powder 30%, β-Si 3 N 4 Ceramic powder 15%, Si powder 55%, weigh α-Si 3 N 4 Ceramic powder 300g, β-Si 3 N 4 150 grams of ceramic powder, 550 grams of silicon powder, 300 grams o...

Embodiment 3

[0028] (1) First prepare β-Si 3 N 4 Ceramic powder: 1000g of α-Si 3 N 4 The ceramic powder is put into a ball milling tank, with silicon nitride balls as the ball milling medium and absolute ethanol as the mixed medium, according to the α-Si 3 N 4 The weight ratio of ceramic powder, silicon nitride grinding ball and dehydrated alcohol is 1: 1.2: 1.8. Weigh 1200 grams of silicon nitride grinding ball and 1800 grams of dehydrated ethanol. After mixing ball milling for 40 hours, the obtained slurry Dry it in a vacuum drying oven for 3 hours, put the powder into a graphite crucible, keep it in a nitrogen atmosphere at 1750°C for 5 hours, then grind the powder and pass it through a 200-mesh sieve to obtain β-Si 3 N 4 ceramic powder;

[0029] (2) Mixing: according to α-Si 3 N 4 Ceramic powder 35%, β-Si 3 N 4 Ceramic powder 20%, Si powder 45%, weigh α-Si 3 N 4 Ceramic powder 350g, β-Si 3 N 4 200 grams of ceramic powder, 450 grams of silicon powder; 350 grams of α-Si 3 ...

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Abstract

This invention discloses connecting rod bush of engine, and manufacturing method therefore. The characteristics are: alpha-Si3N4 ceramic powder, Si powder are mixed, formation and being sintered and processed into final products. The bush made of said ceramic has advantages of: high temperature high-strength, thermal-resistance and shock-resistance, anti-high temperature creep, anti-oxidation, small friction factor, long service life, high loading ability, small clearance and compatibility between the same and wrist pin and light weight. This inventive bush of engine can increase efficiency of the engine, save energy-resource, reduce waste-gas with environmental protection.

Description

technical field [0001] The invention relates to a connecting rod bushing of an engine accessory and a preparation method thereof, in particular to a silicon nitride ceramic connecting rod bushing and a preparation method thereof. technical background [0002] The engine connecting rod bushing is an important wear-resistant part in the piston and connecting rod assembly in the engine. It is installed between the piston pin and the connecting rod to play the role of reducing wear and bearing. The engine connecting rod small end bushing must meet the requirements of compliance, meshing resistance, corrosion resistance, and wear resistance. With the development of the automobile industry, it must also meet high load-carrying capacity and fatigue resistance for high-power, high-speed engines. When the engine is running, the connecting rod bushing and the piston pin form a pair of friction pairs, which transmit the pressure of about 3500k grams of the cylinder and bear a large rol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 韩野尹衍升
Owner 尹衍利
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