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Iron-based powder metallurgy high temperature resistant oil-free bearing and manufacturing method thereof

A technology of iron-based powder metallurgy and manufacturing method, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of bearing and shaft stuck, seepage, oil leakage, etc., to avoid stuck or oil spill effect

Active Publication Date: 2018-06-15
浙江经宇科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the iron-based powder metallurgy oil bearings used in the fuel delivery unit of the garbage generator set, the plastic mechanical molded bushing, etc. often have dry oil or oil leakage due to high temperature, resulting in the phenomenon of bearing and shaft jamming or oil leakage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Mix 2 parts of 399 scaly graphite powder, 0.6 part of zinc stearate, 0.5 part of sulfur powder and 97 parts of 80 mesh reduced iron powder.

[0023] Step 2: Press the mixed raw materials at a density of 5.8g / cm³ to obtain a blank.

[0024] Step 3: Take two parts of sulfur powder and press twice to make two sulfur infiltration blocks.

[0025] Step 4: Sintering the blank at a temperature of 1050° C. under a protective atmosphere of nitrogen and hydrogen.

[0026] Step 5: After the first sintering is completed and released from the furnace, place a piece of sulfur infiltration block prepared in step 3 on the upper and lower ends of the product, and carry out the second sintering at 600°C under the protective atmosphere of nitrogen and hydrogen. Sintering, S dissolves into the gaps between the product crystals under the action of high temperature, and at the same time part of S combines with Fe to form S compounds.

[0027] Step 6: After secondary sintering, debu...

Embodiment 2

[0030] Step 1: Mix 2 parts of 399 scaly graphite powder, 0.6 part of zinc stearate, 0.5 part of sulfur, and 100 parts of 80 mesh reduced iron powder.

[0031] Step 2: Press the mixed raw materials at a density of 6.2g / cm³ to obtain a blank.

[0032] Step 3: Take two parts of sulfur powder and press twice to make two sulfur infiltration blocks.

[0033] Step 4: Sintering the blank at a temperature of 1050° C. under a protective atmosphere of nitrogen and hydrogen.

[0034] Step 5: After the first sintering is completed and released from the furnace, place a piece of sulfur infiltration block prepared in step 3 on the upper and lower ends of the product, and carry out the second sintering at 600°C under the protective atmosphere of nitrogen and hydrogen. In the second sintering, S dissolves into the gaps between the crystals of the product under the action of high temperature, and at the same time, part of S combines with Fe to form S compounds.

[0035] Step 6: After secondar...

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PUM

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Abstract

The invention discloses an iron-based powder metallurgy high temperature resistant oil-free bearing and a manufacturing method thereof. The manufacturing method of the invention includes the following steps: secondary sintering: after the first sintering is completed and released from the furnace, both the upper end and the lower end of the product are placed Put a piece of sulfur infiltration block pressed by sulfur powder, and carry out secondary sintering. Under the action of high temperature, S dissolves into the gap between the crystals of the product, and at the same time, part of S combines with Fe to form S compounds. The S content of the iron-based powder metallurgy high-temperature resistant oil-free bearing produced by this manufacturing method reaches 8%-18%, which achieves the lubricating effect of ordinary iron-based powder oil-impregnated bearings, thereby omitting the process steps of oil immersion, making the bearing It does not contain oil, which avoids the phenomenon of jamming or oil leakage caused by bearing dry oil or oil leakage under high temperature working environment.

Description

technical field [0001] The invention belongs to the technical field of metal material powder metallurgy, and in particular relates to an iron-based powder metallurgy high temperature resistant oil-free bearing and a manufacturing method thereof. Background technique [0002] Metal sintered oil-impregnated bearings are a kind of sintered material made by powder metallurgy process with metal powder as raw material. Metal sintered oil-impregnated bearing products are inherently porous, and have the advantage of being able to freely adjust the number, size and distribution of voids during the manufacturing process. Sintered metal oil-impregnated bearings have been widely used in many fields such as automobiles, household appliances, transportation machinery, agricultural machinery, instruments and meters. [0003] Metal sintered oil-impregnated bearings have the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil during a long workin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/10B22F3/10C23C8/62
CPCB22F3/1007B22F3/1017B22F5/106B22F2999/00C23C8/62B22F2201/02B22F2201/013
Inventor 陈龙水陈贤亮
Owner 浙江经宇科技发展有限公司