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Preparation method of Si3N4 gradient ceramic ball material with hard-surface tough-core high performance

A high-performance, ceramic ball technology, applied in the field of non-oxide-based ceramic materials, can solve the problems of unsatisfactory high-performance bearing products, hard-core toughness mechanical properties, etc., to improve fatigue resistance and service life, excellent Mechanical properties, effects of improving fracture toughness and flexural strength

Active Publication Date: 2016-06-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bearing balls are made of sintered Si 3 N 4 Ceramic materials can improve and overcome shortcomings, but usually traditional sintered Si 3 N 4 Ceramic materials cannot achieve the mechanical properties of hard core and toughness, and cannot meet the needs of high-performance bearing products

Method used

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  • Preparation method of Si3N4 gradient ceramic ball material with hard-surface tough-core high performance
  • Preparation method of Si3N4 gradient ceramic ball material with hard-surface tough-core high performance

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Surface hard core tough high performance Si of the present invention 3 N 4 The preparation method of gradient ceramic ball material specifically comprises the following steps:

[0028] (1) with Si 3 N 4 The powder is used as the base material, and the center is made of β-Si 3 N 4 Seed and Al 2 o 3 -Re 2 o 3 , the surface layer is AlN and Al 2 o 3 -Re 2 o 3 as a sintering aid. Where Re=any one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu.

[0029] In this embodiment, the core is according to Si 3 N 4 : β-Si 3 N 4 Seed: Al 2 o 3 : Lu 2 o 3 The mass fraction ratio is 87%: 3%: 5%: 5% for mixing, and the surface layer is in accordance with Si 3 N 4 :AlN:Al 2 o 3 : Y 2 o 3 The mass fraction ratio is 90%: 2%: 2%: 6% for mixing, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours. After mixing and drying, the core is uniformly mixed Si 3 N 4 -β-Si 3 N...

Embodiment 2

[0034] The surface hard core tough high performance Si of the embodiment of the present invention 3 N 4 The preparation method of gradient ceramic ball material is as follows: the core is according to Si 3 N 4 Powder mass fraction is 89%, β-Si 3 N 4 The mass fraction of seed powder is 1%, MgO-Yb 2 o 3 The mass fraction of the powder is 10% for mixing, and the surface is according to Si 3 N 4 The mass fraction of powder is 86%, the mass fraction of AlN powder is 4%, Al 2 o 3 -Lu 2 o 3 The mass fraction of the powder is 10% for mixing, where MgO:Yb 2 o 3 The mass fraction ratio is 50%: 50%, Al 2 o 3 : Lu 2 o 3 The mass fraction ratio is 50%: 50%, and Si is prepared according to the method of Example 1 3 N 4 Gradient ceramics where the temperature is raised to 1200°C at a ramp rate of 20°C / min, then to 1550°C at a ramp rate of 10°C / min, then to 1800°C at a ramp rate of 5°C / min , and keep it warm for 2h, the nitrogen pressure in the whole sintering process is 0....

Embodiment 3

[0037] The surface hard core tough high performance Si of the embodiment of the present invention 3 N 4 The preparation method of gradient ceramic ball material is as follows: the core is according to Si 3 N 4 Powder mass fraction is 84%, β-Si 3 N 4 The mass fraction of seed powder is 6%, Al 2 o 3 -Y 2 o 3 The mass fraction of the powder is 10% for mixing, and the surface is according to Si 3 N 4 The mass fraction of powder is 88%, the mass fraction of AlN powder is 4%, Al 2 o 3 -Yb 2 o 3 The mass fraction of the powder is 8% for mixing, where Al 2 o 3 : Y 2 o 3 The mass fraction ratio is 50%: 50%, Al 2 o 3 : Yb 2 o 3 The mass fraction ratio is 25%: 75%, prepares Si according to the method for embodiment 1 3 N 4 Gradient ceramics where the temperature is raised to 1200°C at a ramp rate of 20°C / min, then to 1500°C at a ramp rate of 10°C / min, then to 1750°C at a ramp rate of 5°C / min , and keep it warm for 2h, the nitrogen pressure in the whole sintering pr...

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Abstract

The invention provides a preparation method of a Si3N4 gradient ceramic ball material with the hard-surface tough-core high performance. The preparation method comprises the steps that Si3N4 powder is taken as a base body raw material, the core takes beta-Si3N4 seed crystals and Al2O3-Re2O3 as sintering aids, the surface takes AlN and Al2O3-Re2O3 as sintering aids, and a mixture of Si3N4, the beta-Si3N4 seed crystals and Al2O3-Re2O3 and a mixture of Si3N4, AlN and Al2O3-Re2O3 are mixed by mass and dried to obtain mixed powder with the Si3N4-beta-Si3N4 seed crystals-Al2O3-Re2O3 core and the Si3N4-AlN-Al2O3-Re2O3 surface; the mixed powder is processed through forming equipment to obtain a gradient ball blank, and the gradient ball blank is processed through air pressure sintering to obtain the Si3N4 gradient ceramic ball material with the hard-surface tough-core high performance. According to the prepared material, the relative density is larger than 96%, the hardness of the core is 10-20 GPa, and the fracture toughness of the core is 6-14 MPa.m<1 / 2>; the hardness of the exterior is 15-25 GPa, and the fracture toughness of the exterior is 3-10 MPa.m<1 / 2>. The prepared material has the more excellent mechanical performance and has the hard-surface tough-core high performance.

Description

technical field [0001] The invention relates to the field of non-oxide-based ceramic materials, and specifically discloses a high-performance Si 3 N 4 The preparation method of the gradient ceramic ball material. Background technique [0002] High-speed, precise, high-capacity, high-reliability high-performance bearing products are key basic components for high-end CNC machine tools, high-speed trains, wind power and other major equipment. Bearing balls are the core parts of bearing products, and their failure is one of the bottlenecks restricting the development of high-performance bearings. Compared with steel balls used in traditional rolling bearings, silicon nitride bearing balls have excellent properties such as low density, high temperature resistance, high rigidity, high hardness, low thermal expansion coefficient, self-lubrication, non-catastrophic damage, and non-magnetic properties. Bearing balls are made of sintered Si 3 N 4 Ceramic materials can improve and...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/64
CPCC04B35/584C04B35/64C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/775
Inventor 郭伟明于俊杰林华泰
Owner GUANGDONG UNIV OF TECH
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