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High-performance yttrium zirconium ceramic bearing ball and preparation method thereof

A ceramic bearing and high-performance technology, which is applied in the field of yttrium-zirconium ceramic balls, can solve problems such as low sintering performance, uneven density distribution, and inconsistent local shrinkage, so as to reduce sintering temperature and sintering shrinkage, increase initial density, and reduce crack effect

Inactive Publication Date: 2013-02-27
JIANGXI JLMAG RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yttrium-zirconium ceramic bearing ball prepared by this method has a low green body density and a very uneven density distribution, which easily causes inconsistent local shrinkage during the sintering process, resulting in low sintering performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 96.5kg of zirconia powder, 3.5Kg of yttrium oxide powder, and 25Kg of deionized water into the circulating stirring mill for stirring, and add 0.5Kg of ammonium citrate, 0.5Kg of polyethylene glycol, and 0.5Kg of oleic acid at the initial stage of stirring , glycerol 0.5Kg, after stirring for 4hr, pass through a 50-mesh drying net to obtain the mixed slurry. The mixed slurry is granulated through an open spraying device, the granulation temperature is 180°C, and the granulated particles are solid spherical, with a particle size of 80-100um. The granulated powder is passed through two-way pressing equipment with a pressing pressure of 5 MPa, and formed into spherical blanks, and then these spherical blanks are vacuum-packed and then subjected to cold isostatic pressing at a pressing pressure of 100 MPa and a holding time of 120s to obtain yttrium-zirconium ceramic balls bisque. Put the ceramic ball green body into the crucible, put it in the oven, keep it at 80°C fo...

Embodiment 2

[0035] Put the zirconia powder with a weight of 85kg, the yttrium oxide powder of 15Kg, and 17.6Kg of deionized water into the circulating stirring mill and stir, add ammonium citrate 1.5Kg, polyethylene glycol 1Kg, oleic acid 0.75Kg, propane Triol 0.6Kg, after stirring for 6 hours, pass through a 100-mesh drying screen to obtain a mixed slurry. The mixed slurry is granulated through an open spraying device, the granulation temperature is 200°C, and the granulated particles are solid spherical, with a particle size of 20-70um. The granulated powder is passed through a two-way pressing equipment with a pressing pressure of 20MPa, and formed into spherical blanks, and then these spherical blanks are vacuum-packaged and then subjected to cold isostatic pressing at a pressing pressure of 200MPa and a holding time of 30s to obtain yttrium-zirconium ceramic spherical elements Blank. Put the ceramic ball green body into the crucible, put it in the oven, keep it at 120°C for 12 hours...

Embodiment 3

[0037] Put the zirconia powder with a weight of 94.6kg, the yttrium oxide powder of 5.4Kg, and 20Kg of deionized water into the circulating stirring mill and stir, add 0.7Kg of ammonium citrate, 0.5Kg of polyvinyl alcohol, 1Kg of oleic acid, propane Triol 0.7Kg, after stirring for 5 hours, passed through a 150-mesh drying screen to obtain a mixed slurry. The mixed slurry is granulated through an open spraying device, the granulation temperature is 190°C, and the granulated particles are solid spherical, with a particle size of 80-120um. The granulated powder is passed through a two-way pressing equipment with a pressing pressure of 13 MPa to form a ball blank, and then these ball blanks are vacuum-packed and then subjected to cold isostatic pressing at a pressing pressure of 150 MPa and a holding time of 90 seconds to obtain yttrium-zirconium ceramic balls bisque. Put the ceramic ball green body into the crucible, put it in the oven, keep it at 100°C for 8 hours, take it out ...

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Abstract

The invention relates to a high-performance yttrium zirconium ceramic bearing ball and a preparation method thereof, and belongs to the field of structural ceramics. The invention adopts yttrium oxide powder and zirconium oxide powder in submicron order, which are added with a variety of polymers as dispersant agent, adhesive, lubricant and moisturizing agent; a solid spherical granulation material with good particle size distribution and good fluidity are obtained through high-speed stirring distribution and spray granulation process. Granulation material ball billet subjected to two-way pressing needs to be subjected to cold isostatic pressing treatment to obtain a ceramic ball blank. Ceramic ball blank is dried and sintered; and a cooling speed is controlled in a cooling process to obtain the high-performance yttrium zirconium ceramic ball. The invention has advantages of simple process and high process reliability, and can realize low-cost mass production.

Description

technical field [0001] The invention relates to a yttrium-zirconium ceramic ball, in particular to a high-performance yttrium-zirconium ceramic bearing ball and a preparation method thereof. Background technique [0002] With the development of the bearing industry, the rolling body material of the bearing has gradually developed from steel rolling body to ceramic rolling body. Compared with steel rolling elements, ceramic rolling elements have the characteristics of low density, high hardness, non-magnetic, high insulation, corrosion resistance, and long life. At present, the ceramic materials that can be used as ceramic rolling elements are mainly yttrium-zirconium ceramics, alumina, Silicon nitride and silicon carbide materials. Alumina and silicon carbide materials are only suitable for low-end low-speed bearings due to their low mechanical properties, especially fracture toughness. Yttrium-zirconium ceramics and silicon nitride ceramics have good comprehensive mechani...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 蔡报贵任修明毛华云张锦红张毅吴君国滕飞
Owner JIANGXI JLMAG RARE EARTH
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