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Silicon nitride-based continuous function gradient ceramic ball as well as preparation method and application thereof

A silicon nitride-based, functionally graded technology, applied in the field of non-oxide-based ceramic materials, can solve problems such as difficult application, complicated preparation process, and high cost, and achieve the effect of improving fatigue resistance

Active Publication Date: 2018-11-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yu et al achieved surface hard core ductile Si by changing the sintering temperature of the core and the surface layer through a two-step hot pressing sintering method. 3 N 4 The preparation of base gradient ceramic materials, although this method does not have the stress formed at the interface due to the different thermal expansion coefficients of the materials, the preparation process is complicated, the cost is high, and it is difficult to apply to the field of bearing balls

Method used

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  • Silicon nitride-based continuous function gradient ceramic ball as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] A silicon nitride (Si 3 N 4 ) based continuous functional gradient ceramic ball preparation, the specific method is as follows:

[0034] (1) with Si 3 N 4 Powder (particle size2 o 3 Powder (99.9% pure) and Y 2 o 3 powder (purity 99.9%) as an additive, according to Si 3 N 4 Powder mass fraction is 90%, Al 2 o 3 -Y 2 o 3 The mass fraction is 10% for batching, where Al 2 o 3 : Y 2 o 3 The mass fraction ratio is 40%: 60%, with ethanol as solvent and Si 3 N 4 The ball is a ball milling medium, mixed in a planetary ball mill for 8 hours, after mixing and drying, a uniformly mixed Si 3 N 4 -Al 2 o 3 -Y 2 o 3 Mix powder.

[0035] (2) Si 3 N 4 -Al 2 o 3 -Y 2 o 3 The mixed powder was put into a spherical mold for cold isostatic pressing, the cold isostatic pressing pressure was 250 MPa, the holding time was 5 minutes, and the diameter of the obtained spherical green body was 45 mm.

[0036] (3) The resulting Si 3 N 4 -Al 2 o 3 -Y 2 o 3 Put the ...

Embodiment 2

[0042] According to Si 3 N 4 Powder (particle size2 o 3 (99.9% pure)-Y 2 o 3 (purity is 99.9%) mass fraction is 7% to carry out batching, wherein Al 2 o 3 : Y 2 o 3 The mass fraction ratio is 28.6%: 71.4%, Si is prepared according to the method of Example 1 3 N 4 Based on continuous functionally graded ceramic spheres.

[0043] Si prepared in this example 3 N 4 The relative density of the base continuous functionally graded ceramic ball is 98%, the surface hardness is 19GPa, and the fracture toughness (indentation method) is 5.2MPa m 1 / 2 , TiN particle size is 300nm, TiN impregnation depth is 5mm; core hardness is 16.5GPa, fracture toughness (indentation method) is 7.3MPa m 1 / 2 .

Embodiment 3

[0045] According to Si 3 N 4 Powder (particle size2 o 3 (99.9% pure)-Y 2 o 3 (purity is 99.9%) mass fraction is 10% to carry out batching, wherein Al 2 o 3 : Y 2 o 3 The mass fraction ratio is 50%: 50%, and the relative density is ~ 65% of Si prepared according to the method of Example 1 3 N 4 Ceramic balls, in which the temperature is raised to 1200°C at a heating rate of 20°C / min, then raised to 1400°C at a heating rate of 10°C / min, and kept for 2 hours. The sintering atmosphere during the whole process is 1 atm of flowing nitrogen. The Si 3 N 4 The surface layer of the ceramic ball prepared by the method of Example 1 contains TiO 2 Si 3 N 4 Ceramic ball impregnation green body, wherein the vacuum dripping impregnation solution is TiO dispersed by ultrasonic and mechanically stirred 2 Alcohol solution, solid content 10vol%, drip rate 1 drop / second, dipping

[0046] The number of times is 3 times, the immersion time is 15min, and the vacuum degree during immers...

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Abstract

The invention belongs to the field of non-oxide-based ceramics and discloses a silicon nitride-based continuous function gradient ceramic ball as well as a preparation method and application thereof.The method comprises the following steps of mixing Si3N4, Al2O3 and Re2O3 respectively in mass fraction, and drying to obtain mixed powder; enabling the mixed powder to be subjected to isostatic coolpressing to obtain a ceramic ball green body, carrying out low-temperature pressureless sintering to obtain a ceramic ball blank; enabling the blank to be dipped in a TiO2 alcohol solution by using avacuum leak through method so as to enable a surface layer to contain TiO2, and then carrying out air pressure sintering to obtain a Si3N4-based continuous function gradient ceramic ball. According tothe ceramic ball prepared by utilizing the method, the relative density is greater than 96%, the surface layer hardness is 16-22GPa, the breaking tenacity is 4-7MPa / m<1 / 2>, the TiN particle sizes are100-500 nm, the dipping depth is 1-6mm, the core hardness is 15-20GPa, and the breaking tenacity is 5-8MPa / m<1 / 2>.

Description

technical field [0001] The invention belongs to the field of non-oxide-based ceramic materials, in particular to a silicon nitride-based continuous functional gradient ceramic ball and its preparation method and application. Background technique [0002] With the rapid development of industrial technology, the requirements for bearings are getting higher and higher, and the bearing structure is miniaturized, the size is precise, the speed is high, the temperature is high, and the satisfaction of harsh working conditions such as high vacuum and anti-corrosion is also increasing. Urgent, bearings using steel materials can no longer meet certain properties. In order to improve the performance of high-speed and high-precision bearings to increase their fatigue life, structural ceramics are used at home and abroad to manufacture spheres or other bearing parts, which can significantly prolong the performance and life of high-speed and high-precision bearings. Among them, Si 3 N ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/64C04B41/87
CPCC04B35/584C04B35/64C04B41/009C04B41/5041C04B41/87C04B2235/6562C04B2235/6567C04B2235/658C04B2235/77C04B2235/775C04B2235/96
Inventor 郭伟明于俊杰魏万鑫林华泰
Owner GUANGDONG UNIV OF TECH
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