CN103524133A - Preparation technology of silicon nitride ceramic balls - Google Patents
Preparation technology of silicon nitride ceramic balls Download PDFInfo
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- CN103524133A CN103524133A CN201310528294.0A CN201310528294A CN103524133A CN 103524133 A CN103524133 A CN 103524133A CN 201310528294 A CN201310528294 A CN 201310528294A CN 103524133 A CN103524133 A CN 103524133A
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Abstract
The invention belongs to the technical field of ceramic ball preparation, and particularly relates to a preparation technology of silicon nitride ceramic balls. According to the preparation technology, silicon nitride powder is used the raw material, and through the steps of compounding, slurrying, spray drying, forming, sizing, sintering and polishing, the silicon nitride ceramic balls are obtained. The preparation technology of the silicon nitride ceramic balls is simple, and convenient to operate, and the obtained silicon nitride ceramic balls are high in strength, and superior in impact resistance.
Description
Technical field
The invention belongs to Ceramic Balls preparing technical field, particularly a kind of preparation technology of silicon nitride ceramic ball.Background technology
Silicon nitride, chemical formula is Si
3n
4, be a kind of important structural ceramic material.It is a kind of superhard material, and itself has oilness, and wear-resistant, is atomic crystal; Anti-oxidant during high temperature.And it can also resist thermal shock, in air, be heated to more than 1000 ℃, sharply cooling sharply heating again, can be not cracked yet.The characteristic just because of silicon nitride ceramics with excellence like this, is usually used for manufacturing the mechanical components such as bearing, blade of gas turbine, mechanical seal ring, permanent mold.Silicon nitride ceramic ball is the high technology ceramics of high temperature sintering in nonoxidizing atmosphere, has high strength, and high-wearing feature is high temperature resistant, corrosion-resistant, acid-and base-resisting, can be in seawater uses for a long time, and has the superperformance of the exhausted magnetic of insulation.Its density is little, is almost 1/3 weight of bearing steel, and during rotation, centrifugal force is little, can realize and running up.It also has self lubricity, can use in the environment of unlubricated medium high pollution, becomes the first-selected ball of ceramic bearing, hybrid ceramic ball bearing.But the intensity of silicon nitride ceramic ball and shock resistance need to improve at present.
Summary of the invention
The preparation technology who the object of this invention is to provide a kind of silicon nitride ceramic ball, the silicon nitride ceramic ball intensity and the excellent shock resistance that make.
The technical solution used in the present invention is as follows:
A preparation technology for silicon nitride ceramic ball, take silicon nitride powder as raw material,, moulding dry through batching, slurrying, spraying, shape, burn till, polishing obtains.
During batching, add yttrium oxide, aluminum oxide, nano-silicon nitride and ethanol, yttrium oxide, aluminum oxide, nano-silicon nitride three add-on are separately the 0.1-1.0% of silicon nitride powder quality.
Three's add-on is separately preferably the 0.2-0.5% of silicon nitride powder quality.
Described nano-silicon nitride is selected conventional commercially available prod.
The amount that ethanol adds is the 4-10% of silicon nitride powder quality.
Add yttrium oxide, aluminum oxide, nano-silicon nitride and ethanol to mix to stir that after 8-10 hour, to carry out spray dried dry.
During sizing, adopt the pressure pressurize 3-5min of 150-250MPa.
Firing temperature is not less than 1700 ℃, and the time is 10-14h.
Preferably, after sizing, first come unstuck and burn till, come unstuck and carry out at 1100-1200 ℃, usually time is 8-12h, specifically can in vacuum degumming stove, carry out.
Silicon nitride powder is high purity silicon nitride powder, and purity is not less than 99.0%.
The optional high pure nitrogen of silicon nitride and silica flour are 1300-1400 ℃, normal pressure-sintered acquisition.After silicon nitride obtains, can select various ways separately repeatedly or combination carry out fragmentation, when particle diameter is less than 1 μ m, be more conducive to the carrying out of follow-up work.Because raw material used before sintering is more tiny, the Ceramic Balls performance of sintering characteristic and sintering is just better, is more conducive to form evenly good weave construction.
Compared with prior art, tool has the following advantages in the present invention:
The simple convenient operation of silicon nitride ceramic ball preparation method of the present invention, the silicon nitride ceramic ball intensity of acquisition is high, excellent shock resistance.
Embodiment
With specific embodiment, technical scheme of the present invention is described below, but protection scope of the present invention is not limited to this:
Embodiment 1
A preparation technology for silicon nitride ceramic ball, take silicon nitride powder as raw material,, moulding dry through batching, slurrying, spraying, shape, burn till, polishing obtains.
Get silicon nitride powder (purity is 99.5%) 1000 weight parts (lower same), being crushed to particle diameter is 0.4 μ m left and right; Add respectively 50 parts of 5 parts of yttrium oxide, 3 parts, aluminum oxide, 5 parts of nano-silicon nitrides and ethanol, fully mix and stir that after 10 hours, to carry out spray dried dry, and utilize ball press to be shaped to Ceramic Balls, the pressure compacting 4min in 230MPa shapes afterwards.Then enter vacuum degumming stove and come unstuck, temperature is 1150 ℃, and the time is 10 hours; Enter afterwards sintering oven sintering, firing temperature is 1700 ℃, and the time is 12 hours.
The silicon nitride ceramic ball ultimate compression strength that the present embodiment obtains is 3.5GPa, bending strength 900MPa, toughness 7.0Nm/cm
2, use temperature is more than 1000 ℃.
Embodiment 2
A preparation technology for silicon nitride ceramic ball, take silicon nitride powder as raw material,, moulding dry through batching, slurrying, spraying, shape, burn till, polishing obtains.
Get silicon nitride powder (purity is 99%) 1000 weight parts (lower same), being crushed to particle diameter is 0.4 μ m left and right; Add respectively 50 parts of 3 parts of yttrium oxide, 5 parts, aluminum oxide, 3 parts of nano-silicon nitrides and ethanol, fully mix and stir that after 8 hours, to carry out spray dried dry, and utilize ball press to be shaped to Ceramic Balls, under the pressure of 200MPa, suppress 3min afterwards and shape.Then enter vacuum degumming stove and come unstuck, temperature is 1200 ℃, and the time is 11 hours; Enter afterwards sintering oven sintering, firing temperature is 1750 ℃, and the time is 13 hours.
The silicon nitride ceramic ball ultimate compression strength that the present embodiment obtains is 3.2GPa, bending strength 850MPa, toughness 6.7Nm/cm
2, use temperature is more than 1000 ℃.
Embodiment 3
A preparation technology for silicon nitride ceramic ball, take silicon nitride powder as raw material,, moulding dry through batching, slurrying, spraying, shape, burn till, polishing obtains.
Get silicon nitride powder (purity is 99.9%) 1000 weight parts (lower same), being crushed to particle diameter is 0.4 μ m left and right; Add respectively 40 parts of 5 parts of yttrium oxide, 5 parts, aluminum oxide, 1 part of nano-silicon nitride and ethanol, fully mix and stir that after 8 hours, to carry out spray dried dry, and utilize ball press to be shaped to Ceramic Balls, the pressure compacting 5min in 180MPa shapes afterwards.Then enter vacuum degumming stove and come unstuck, temperature is 1100 ℃, and the time is 12 hours; Enter afterwards sintering oven sintering, firing temperature is 1700 ℃, and the time is 14 hours.
The silicon nitride ceramic ball ultimate compression strength that the present embodiment obtains is 3.6GPa, bending strength 870MPa, toughness 7.1Nm/cm
2, use temperature is more than 1000 ℃.
Claims (7)
1. a preparation technology for silicon nitride ceramic ball, take silicon nitride powder as raw material, it is characterized in that,, moulding dry through batching, slurrying, spraying, shape, burn till, polishing obtains.
2. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 1, it is characterized in that, during batching, add yttrium oxide, aluminum oxide, nano-silicon nitride and ethanol, yttrium oxide, aluminum oxide, nano-silicon nitride three add-on are separately the 0.1-1.0% of silicon nitride powder quality.
3. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 2, is characterized in that, three's add-on is separately the 0.2-0.5% of silicon nitride powder quality.
4. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 2, is characterized in that, the particle diameter of silicon nitride powder is not more than 1 μ m.
5. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 2, is characterized in that, adopts the pressure pressurize 3-5min of 150-250MPa during sizing.
6. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 2, is characterized in that, firing temperature is not less than 1700 ℃, and sintering time is 10-14h.
7. the preparation technology of a kind of silicon nitride ceramic ball as claimed in claim 6, is characterized in that, after sizing, first comes unstuck and burns till, comes unstuck and at 1100-1200 ℃, carries out 8-12h.
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|---|---|---|---|
| CN201310528294.0A CN103524133A (en) | 2013-10-30 | 2013-10-30 | Preparation technology of silicon nitride ceramic balls |
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| CN201310528294.0A CN103524133A (en) | 2013-10-30 | 2013-10-30 | Preparation technology of silicon nitride ceramic balls |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665696A (en) * | 2016-02-23 | 2016-06-15 | 桐乡市搏腾贸易有限公司 | Nanometer silicon nitride bearing material for machinery and preparation method thereof |
| CN109354503A (en) * | 2018-11-14 | 2019-02-19 | 江苏高越高新科技有限公司 | A kind of manufacture craft of silicon nitride ceramic ball |
| CN111747743A (en) * | 2020-06-12 | 2020-10-09 | 广州凯立达电子股份有限公司 | Spherical piezoelectric ceramic and preparation method thereof |
| CN115667185A (en) * | 2020-05-26 | 2023-01-31 | 株式会社东芝 | Silicon nitride sintered body, wear-resistant member using same, and method for producing silicon nitride sintered body |
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| CN101125755A (en) * | 2006-08-15 | 2008-02-20 | 上海材料研究所 | Method for preparing large scale ceramic ball |
| CN101302110A (en) * | 2008-06-12 | 2008-11-12 | 上海交通大学 | Method for preparing large-size ceramic grinding ball and mould |
| CN101538161A (en) * | 2009-01-21 | 2009-09-23 | 北京中材人工晶体有限公司 | High density and long-life silicon nitride ceramic material |
| CN101792318A (en) * | 2010-03-19 | 2010-08-04 | 江苏力星钢球有限公司 | High-precision manufacture process of precise ceramic ball |
| CN102795860A (en) * | 2012-07-11 | 2012-11-28 | 北京中材人工晶体研究院有限公司 | Method for preparing silicon nitride ceramic balls |
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2013
- 2013-10-30 CN CN201310528294.0A patent/CN103524133A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125755A (en) * | 2006-08-15 | 2008-02-20 | 上海材料研究所 | Method for preparing large scale ceramic ball |
| CN101302110A (en) * | 2008-06-12 | 2008-11-12 | 上海交通大学 | Method for preparing large-size ceramic grinding ball and mould |
| CN101538161A (en) * | 2009-01-21 | 2009-09-23 | 北京中材人工晶体有限公司 | High density and long-life silicon nitride ceramic material |
| CN101792318A (en) * | 2010-03-19 | 2010-08-04 | 江苏力星钢球有限公司 | High-precision manufacture process of precise ceramic ball |
| CN102795860A (en) * | 2012-07-11 | 2012-11-28 | 北京中材人工晶体研究院有限公司 | Method for preparing silicon nitride ceramic balls |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665696A (en) * | 2016-02-23 | 2016-06-15 | 桐乡市搏腾贸易有限公司 | Nanometer silicon nitride bearing material for machinery and preparation method thereof |
| CN109354503A (en) * | 2018-11-14 | 2019-02-19 | 江苏高越高新科技有限公司 | A kind of manufacture craft of silicon nitride ceramic ball |
| CN115667185A (en) * | 2020-05-26 | 2023-01-31 | 株式会社东芝 | Silicon nitride sintered body, wear-resistant member using same, and method for producing silicon nitride sintered body |
| CN111747743A (en) * | 2020-06-12 | 2020-10-09 | 广州凯立达电子股份有限公司 | Spherical piezoelectric ceramic and preparation method thereof |
| CN111747743B (en) * | 2020-06-12 | 2022-08-12 | 广州凯立达电子股份有限公司 | Spherical piezoelectric ceramic and preparation method thereof |
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Application publication date: 20140122 |