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Corrosion-resistant and wear-resistant ceramic bearing and preparation method thereof

A ceramic bearing and wear-resistant technology, applied to wear-resistant full-ceramic bearings, can solve the problems of reduced wear resistance, corrosion, aggravated aging, etc., and achieve the effect of improving service life, reducing wear and reducing friction loss.

Active Publication Date: 2020-04-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a certain amount of hydrolysis of silicon nitride in aqueous solution, and the second phase formed by the sintering aid will also corrode during service, which will aggravate aging and lead to a sharp decrease in wear resistance

Method used

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  • Corrosion-resistant and wear-resistant ceramic bearing and preparation method thereof
  • Corrosion-resistant and wear-resistant ceramic bearing and preparation method thereof
  • Corrosion-resistant and wear-resistant ceramic bearing and preparation method thereof

Examples

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preparation example Construction

[0030] In order to realize the above-mentioned object of the invention, the concrete preparation method that the present invention adopts can comprise the following steps:

[0031] First, the ZrO 2 and Y 2 o 3 The powder is added with alcohol according to the mass ratio of (96-98): (2-4) to form a slurry with a certain solid content for ball milling, and the slurry obtained by ball milling is dried, sieved, dry-pressed and preformed, cold isostatic Compression molding, sintering, hot isostatic pressing post-treatment, that is, ZrO for inner and outer rings 2 ceramics. In some embodiments, the inner and outer ring raw materials ZrO 2 and Y 2 o 3 The solid content of the slurry prepared from the powder is 19-23vol%. In a specific embodiment, the process parameters of ball milling and drying can be: the ratio of ball to material is 1:1-2:1, the rotation speed of ball mill is 200-400rpm, the time of ball milling is 6-10h, and the drying temperature is 100°C- 120℃, drying t...

Embodiment 1

[0039] A corrosion-resistant, wear-resistant ceramic bearing and a preparation method thereof, comprising the following steps:

[0040] Step 1: Weigh 96g ZrO 2 Powder, with 4g Y 2 o 3 Powder mixing, add 40.3g alcohol as solvent, 100gZrO 2 The ball is the ball milling medium, milled at 200rpm for 10h, then baked in a constant temperature oven at 100°C for 4h, ground, and passed through a 100-mesh sieve; the obtained powder was dry-pressed and preformed under 20MPa pressure and then cold-pressed under 250MPa pressure for 6 minutes, place the treated sample in a muffle furnace, and after sintering at 1350°C for 1.5h, perform post-treatment by hot isostatic pressing. The post-treatment temperature is 1350°C, and the time is 1h. ±23.6MPa, fracture toughness of 10.41±0.11MPa m 1 / 2 ZrO 2 ceramics;

[0041] Step 2: Weigh 25g ZrO 2 Powder, 74.25g Al 2 o 3 with 0.75g Cr 2 o 3 Powder mixing, add 64g alcohol as solvent, 200g Al 2 o 3 The ball is the ball milling medium, mille...

Embodiment 2

[0045] A corrosion-resistant, wear-resistant ceramic bearing and a preparation method thereof, comprising the following steps:

[0046] Step 1: Weigh 96g ZrO 2 Powder, with 4g Y 2 o 3 Powder mixing, add 50.6g alcohol as solvent, 200gZrO 2 The ball is the ball milling medium, milled at 400rpm for 6 hours, then put it into a 120°C constant temperature oven for 2 hours, grind, and pass through a 100-mesh sieve; the obtained powder is preformed under a pressure of 40MPa and then cold-pressed under a pressure of 300MPa for 3 minutes, place the treated sample in a muffle furnace, and after sintering at 1450°C for 0.5h, perform post-treatment by hot isostatic pressing. The post-treatment temperature is 1250°C and the time is 3h. ±25.2MPa, fracture toughness of 13.12±0.23MPa m 1 / 2 ZrO 2 ceramics;

[0047] Step 2: Weigh 15g ZrO 2 Powder, 84.75g Al 2 o 3 with 0.25g Cr 2 o 3 Powder mixing, add 81.5g alcohol as solvent, 100g Al 2 o 3The ball is the ball milling medium, milled...

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Abstract

The invention discloses a corrosion-resistant and wear-resistant ceramic bearing and a preparation method thereof. The corrosion-resistant and wear-resistant ceramic bearing comprises an outer ring, an inner ring, a ball and a retainer, wherein the ball is arranged between the outer ring and the inner ring, the outer ring and the inner ring are made of hot isostatic pressing ZrO2 ceramic, the ballis made of hot isostatic pressing ZrO2 reinforced Al2O3 ceramic, the retainer is arranged on the periphery of the ball and partially wraps the ball, and the retainer is made of polytetrafluoroethylene. The ceramic bearing prepared by the method has excellent corrosion resistance and wear resistance in an acid corrosion environment.

Description

technical field [0001] The invention relates to a corrosion-resistant and wear-resistant ceramic bearing and a preparation method thereof. 2 Ceramics as inner and outer rings, post-treated ZrO by hot isostatic pressing 2 Reinforced Al 2 o 3 A corrosion-resistant and wear-resistant all-ceramic bearing assembled by using ceramics as balls and polytetrafluoroethylene as a cage belongs to the field of preparation of ceramic bearings. Background technique [0002] Bearings are an important part of contemporary mechanical equipment. They play an important role in supporting the mechanical rotating body, reducing the friction coefficient during its movement, and ensuring its rotation accuracy. With the rapid development of aerospace, military defense, power electronics and other industries, the use environment of precision bearing parts is becoming more and more complex. In some special use environments, such as corrosive environments with a certain pH, it is difficult for trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C19/02F16C33/62F16C33/32F16C33/44C04B35/10C04B35/48C04B35/622B28B3/00
CPCB28B3/003C04B35/10C04B35/48C04B35/622C04B2235/3225C04B2235/3241C04B2235/3244C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567C04B2235/96F16C19/02F16C33/303F16C33/32F16C33/44F16C33/62F16C2202/04F16C2206/44F16C2206/48F16C2208/32F16C2220/20F16C2300/42
Inventor 曾宇平梁汉琴左开慧夏咏锋姚冬旭尹金伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI