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Preparation method of silicon nitride ceramic balls

A technology of silicon nitride ceramic balls and ceramic balls, which is applied in the field of preparation of silicon nitride ceramic balls, can solve the problems of high production cost, high sintering pressure, and low production efficiency, achieve self-lubrication and good rigidity, and improve the overall durability Abrasiveness and the effect of increasing the service life

Inactive Publication Date: 2020-03-27
上海步进精密陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Higher sintering pressure easily leads to a series of problems such as complex equipment, high requirements on mold materials, high energy consumption, low production efficiency and high production cost

Method used

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  • Preparation method of silicon nitride ceramic balls

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of silicon nitride powder:

[0043] (1) Boil the rice husk in dilute hydrochloric acid with a volume concentration of 10% for 1 hour, wash and dry it, then place it in a high-temperature furnace and carbonize it at 550°C for 1 hour, then raise the temperature to 610°C, the ash Add ethylene glycol for grinding for 1 h, the amount of ethylene glycol added is 0.025% mL of ethylene glycol per 1 g of ashed rice husk powder to obtain carbonized rice husk powder with a particle size of 0.5 μm;

[0044] (2) Mix carbonized rice husk powder, silicon nitride fine powder and alumina with a weight ratio of 85:10:5 evenly, add 0.05% ethanol of silicon nitride powder, grind it in a grinder for 24 hours, and then dry it. Molded, placed in a vacuum furnace, under a nitrogen pressure of 0.02MPa, the temperature was raised to 1350°C at a rate of 10°C / min, and kept for 10h to obtain silicon nitride powder.

Embodiment 2

[0045] Embodiment 2: a kind of preparation method of silicon nitride ceramic ball, wherein silicon nitride powder adopts the raw material that obtains in embodiment 1, concrete preparation steps are as follows:

[0046](1) Ceramic ball raw material preparation: Mix the dried ceramic raw materials evenly in proportion, pass through a 200-mesh sieve, put the sifted powder in a ball mill, and ball mill at a speed of 350r / min for 8 hours. The ceramic raw material comprises the following components according to mass percentage:

[0047] Silicon nitride powder: 85%;

[0048] Yttrium oxide: 5%;

[0049] Erbium oxide: 5%;

[0050] Hafnium dioxide: 1%;

[0051] Titanium dioxide: 3%;

[0052] Magnesium oxide: 1%;

[0053] (2) Compression molding: put the powder obtained in step (1) into a mold, and press it into a spherical shape by cold isostatic pressing;

[0054] (3) Sintering: under normal pressure, put the powder in the mold, in the sintering furnace, heat up to 1550°C at a s...

Embodiment 3

[0056] Embodiment 3: A kind of preparation method of silicon nitride ceramic ball, differs from embodiment 1 in that, ceramic raw material comprises following components according to mass percentage:

[0057] Silicon nitride powder: 95%;

[0058] Yttrium oxide: 1%;

[0059] Erbium oxide: 1%;

[0060] Hafnium dioxide: 0.5%;

[0061] Titanium dioxide: 1%;

[0062] Magnesium Oxide: 1.5%.

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Abstract

The invention discloses a preparation method of silicon nitride ceramic balls, and relates to the technical field of ceramic preparation. According to the technical key points, the preparation methodof the silicon nitride ceramic balls comprises the steps of ceramic ball raw material preparation, compression molding, sintering, grinding and polishing. Ceramic ball raw materials comprise the following components by the mass percentage: 85-95% of silicon nitride powder, 1-5% of yttrium oxide, 1-10% of erbium oxide, 0.5-2% of hafnium dioxide, 1-5% of titanium dioxide, and 0.5-2% of magnesium oxide. The silicon nitride ceramic balls prepared by the preparation method have the advantages of low density, high hardness, low friction coefficient, self-lubrication and good rigidity.

Description

technical field [0001] The invention relates to the field of ceramic preparation, more specifically, it relates to a method for preparing silicon nitride ceramic balls. Background technique [0002] Because ceramic balls have significant advantages such as high density, high mechanical strength, and good wear resistance, they are widely used as wear-resistant parts in sliding devices such as bearings, ball nuts, or fluid valve cores that control high-pressure fluids to achieve long-term stable work. Features that reduce maintenance costs. [0003] The sintering process of silicon nitride ceramics is generally divided into three types: hot isostatic pressing, hot pressing and atmospheric pressure sintering. [0004] In the Chinese invention application patent application publication number CN105622109A, a method for preparing silicon nitride ceramic balls and silicon nitride ceramic balls is disclosed. The preparation method includes (1) mixing silicon nitride powder, sinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/64
CPCC04B35/584C04B35/62204C04B35/64C04B2235/3225C04B2235/3224C04B2235/3206C04B2235/3244C04B2235/3232C04B2235/3217C04B2235/422
Inventor 阮涛
Owner 上海步进精密陶瓷有限公司
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