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Silicon nitride rolling element with excellent fatigue performances and manufacturing method thereof

A technology for rolling elements and manufacturing methods, which is applied in the field of ceramic materials and can solve problems such as the inability to change the content and distribution of grain boundary phases

Inactive Publication Date: 2016-02-10
SHANGHAI RES INST OF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the HIP post-treatment of GPS sintered products can improve performance such as reliability and strength, this method cannot change the content and distribution of grain boundary phases, and even the grain boundary phases that become liquid phases at high temperatures due to the extrusion of high-pressure gas will more easily aggregate to form segregation

Method used

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  • Silicon nitride rolling element with excellent fatigue performances and manufacturing method thereof
  • Silicon nitride rolling element with excellent fatigue performances and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1 A kind of Si with superior fatigue performance 3 N 4 rolling element

[0016] Its manufacturing method includes the following process steps:

[0017] Mainly containing α-Si 3 N 4 Si 3 N 4 Powder is used as the raw material, and about 10% of the mass fraction of rare earth element oxides, Al oxides and nitrides are added to it, mixed evenly by ball mill wet mixing, and the raw material mixture is dry-pressed into a green body, which is cooled and isostatic. After pressing to make it more dense, carry out air pressure sintering, that is, place the green body in 1-10MPa N 2 Sintering is carried out in the temperature range of 1700-1900°C in the atmosphere, and the holding time is 1-2h. After the sintering is completed, the N 2 Or Si at a temperature of 1700-1900°C in an Ar atmosphere 3 N 4 The sintered body is subjected to HIP treatment, and then heat treatment, the Si 3 N 4 The sintered body is placed in N 2 In the atmosphere, keep it warm at 1300...

Embodiment 2

[0019] Embodiment 2 A kind of Si with superior fatigue performance 3 N 4 rolling element

[0020] Si with sintering aid added 3 N 4 The powder is mixed evenly, and the raw material mixture is formed into a biscuit by dry pressing, and after being further compacted by cold isostatic pressing, the gas pressure sintering is carried out, that is, the biscuit is placed in a 1-10MPa N 2 Sintering is carried out in the temperature range of 1700-1900°C in the atmosphere, and the holding time is 1-2h. After the sintering is completed, the N 2 Or Si at a temperature of 1700-1900°C in an Ar atmosphere 3 N 4 The sintered body is subjected to HIP treatment, and then heat treatment, the Si 3 N 4 The sintered body is placed in vacuum and kept at 1300-1500°C for 10-30h, so that Si 3 N 4 The grain boundary phase (glass phase) in the sintered body is further absorbed by the Sialon phase contained in the sintered body. At the same time, the grain boundary phase is crystallized to improv...

Embodiment 3

[0022] Embodiment 3 A kind of Si with superior fatigue performance 3 N 4 rolling element

[0023] Si with sintering aid added 3 N 4 The powder is mixed evenly, and the raw material mixture is formed into a biscuit by dry pressing, and after being further compacted by cold isostatic pressing, the gas pressure sintering is carried out, that is, the biscuit is placed in a 1-10MPa N 2 Sintering is carried out in the temperature range of 1700-1900°C in the atmosphere, and the holding time is 1-2h. After the sintering is completed, heat treatment is carried out, and the Si 3 N 4 The sintered body is placed in N 2 In the atmosphere, keep it warm at 1300~1500℃ for 10~30h, so that Si 3 N 4 The grain boundary phase (glass phase) in the sintered body is further absorbed by the Sialon phase contained in the sintered body. At the same time, the grain boundary phase is crystallized to improve its strength and its bonding force with the matrix material. Finally, machining is performed...

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Abstract

The invention relates to the field of ceramic materials and especially relates to a silicon nitride rolling element with excellent fatigue performances and a manufacturing method thereof. The invention discloses a manufacturing method of the silicon nitride rolling element with excellent fatigue performances. The preparation method comprises 1, carrying out Si3N4 sintered body HIP treatment and carrying out heat treatment or 2, directly carrying out heat treatment, wherein the heat treatment process comprises putting a Si3N4 sintered body in vacuum or N2 atmosphere and carrying out thermal insulation at a temperature of 1300-1500 DEG C for 10-30h. Through the heat treatment method, a crystal boundary phase in the Si3N4 sintered body is further absorbed by a Sialon phase in the sintered body so that Si3N4 crystal boundary phase content is reduced, crystal boundary phase crystallization is promoted, crystal boundary phase strength is improved and the bonding force between the crystal boundary phase and a base material is improved. The method can effectively improve Si3N4 sintered body high temperature performances.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a silicon nitride rolling element with excellent fatigue performance and a manufacturing method thereof. Background technique [0002] Si 3 N 4 The rolling contact fatigue failure mode of spalling rather than catastrophic fracture of ceramics is the basis of its use as a bearing material, and Si 3 N 4 Ceramics have low theoretical density, low expansion coefficient, high hardness, high elastic modulus, wear resistance, high temperature resistance, acid and alkali corrosion resistance, good self-lubrication, non-magnetic conductivity, non-conductive properties, etc., which are widely used in high-speed , high precision, strong corrosion, ultra-low temperature and other extreme working conditions. [0003] Since Si 3 N 4 The difficulty of sintering ceramics is usually liquid phase sintering, that is, adding a certain amount of sintering aids that can form a liquid phase at hi...

Claims

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Application Information

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IPC IPC(8): C04B41/80
Inventor 张培志祁海郭方全
Owner SHANGHAI RES INST OF MATERIAL
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