CN103011873A - Preparation method of silicon nitride toughening ceramic ball - Google Patents
Preparation method of silicon nitride toughening ceramic ball Download PDFInfo
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- CN103011873A CN103011873A CN2012104966375A CN201210496637A CN103011873A CN 103011873 A CN103011873 A CN 103011873A CN 2012104966375 A CN2012104966375 A CN 2012104966375A CN 201210496637 A CN201210496637 A CN 201210496637A CN 103011873 A CN103011873 A CN 103011873A
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Abstract
The invention relates to a preparation method of a silicon nitride toughening ceramic ball, belonging to the field of ceramics preparation. The preparation method of the silicon nitride toughening ceramic ball comprises the steps of: preparing a ceramic raw material, blanking and forming, sintering, grinding and polishing. The ceramics raw material comprises the following components in percentage by mass: 65-85 percent of beta-Si3N4, 10-25 percent of SiC whisker and 5-10 percent of sintering additive. The preparation method can realize that the silicon nitride toughening ceramic ball is sintered at a normal pressure, and is simple in steps and convenient and easy to operate. The silicon nitride toughening ceramic ball prepared by using the method has the advantages of high strength, good compactness, remarkably improved flexibility, and excellent high temperature and abrasion resistance, and can be widely used as a rolling body of a bearing.
Description
Technical field
The present invention relates to a kind of preparation method of silicon nitride toughening ceramic ball, belong to ceramic preparation field.
Background technology
Ball bearing is a kind of of rolling bearing, and the ball ball is contained in the centre of interior steel ring and outer rim, can bear larger load.Ceramic Balls particularly silicon nitride ball has low density, high rigidity, low-friction coefficient, and the characteristics such as wear-resisting, self-lubricating and good rigidly are particularly suitable for doing at a high speed, the rolling body of high precision and long lifetime hybrid ceramic ball bearing.
Silicon carbide whisker is a kind of few defects, and the single crystal fibre of certain length-to-diameter ratio is arranged, and it has goodish high temperature resistant property and high strength very.It is very high and extremely high temperature resistant that silicon nitride ceramics has high intensity, and its intensity does not descend at 1200 ℃ high temperature, can not be melt into after being heated and melt body, simultaneously, its resistance to chemical corrosion is excellent, the mineral acid that ability is nearly all and 30% following caustic soda soln, the also a lot of organic acid corrosion of ability.
The sintering process of silicon nitride ceramics is generally three kinds: hot isostatic pressing (HIP), hot pressing (HP) and gas pressure sintering.The pressure of atmosphere sintering is 5 ~ 10MPa, and the pressure of hot pressed sintering is about 70Mpa, and the pressure of the sintering of hot isostatic pressing is 150MPa ~ 200MPa.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of silicon nitride toughening ceramic ball, this preparation method can be implemented in sintered silicon nitride toughening ceramic ball under the normal pressure, the intensity of utilizing the method to prepare is high, compactness is good, toughness obviously improves, and high temperature resistant and wear-resisting excellence can be widely used as the rolling body of bearing.
A kind of preparation method of silicon nitride toughening ceramic ball comprises the step of ceramic raw material preparation, base shaping, sintering and grinding and polishing, is undertaken by following processing step:
1. ceramic raw material preparation: ceramic raw material is after drying mixed in proportion, sieve, the powder after sieving is placed the ball mill ball milling;
2. press forming: with step 1. the gained powder place grinding tool, adopt the method for isostatic cool pressing to be pressed into sphere;
3. sintering: under the normal pressure, powder is placed mould, in 1600 ℃ ~ 1800 ℃, insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating at sintering oven;
4. grinding and polishing: the gained Ceramic Balls is ground and polished;
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
β-Si
3N
4 65%~85%
SiC whisker 10% ~ 25%
Sintering aid 5% ~ 10%.
The preferred described sintering aid of the preparation method of silicon nitride toughening ceramic ball of the present invention is selected from Al
2O
3, MgO, Y
2O
3, ZrO
2In at least a.
1. the preferred described step of the preparation method of silicon nitride toughening ceramic ball of the present invention is undertaken by following technique: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, powder after sieving is placed ball mill, in speed ball milling 6h～10h of 300 ~ 360r/min.
3. the preferred described step of the preparation method of silicon nitride toughening ceramic ball of the present invention is undertaken by following technique: under the normal pressure, powder is placed mould, speed with 60 ~ 80 ℃/min in sintering oven is warming up to 1600 ℃ ~ 1800 ℃, and insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating.
The preferred described step of the preparation method of silicon nitride toughening ceramic ball of the present invention 4., carry out as follows: Ceramic Balls is at first carried out attrition process, the workpiece that will carry out subsequently after the attrition process polishes, the sphericity of Ceramic Balls is no more than 0.07 micron, and surfaceness is no more than 0.008 micron.
The preferred described ceramic raw material of the preparation method of silicon nitride toughening ceramic ball of the present invention by mass percentage, is comprised of following component:
β-Si
3N
4 70%~80%
SiC whisker 15% ~ 25%
Sintering aid 5% ~ 10%.
The preferred described ceramic raw material of the preparation method of silicon nitride toughening ceramic ball of the present invention by mass percentage, is comprised of following component:
β-Si
3N
4 75%
SiC whisker 20%
Sintering aid 5%.
The preferred described sintering aid of the preparation method of silicon nitride toughening ceramic ball of the present invention by mass percentage, is comprised of following component:
Al
2O
3 60%
MgO 20%
Y
2O
3 20%。
The further preferred following technical proposals of the preparation method of silicon nitride toughening ceramic ball of the present invention:
A kind of preparation method of silicon nitride toughening ceramic ball comprises following processing step:
1. ceramic raw material preparation: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, the powder after sieving is placed ball mill, in speed ball milling 6h ~ 10h of 300 ~ 360r/min;
2. press forming: with step 1. the gained powder place grinding tool, adopt the method for isostatic cool pressing to be pressed into sphere;
3. sintering: under the normal pressure, powder is placed mould, the speed with 60 ~ 80 ℃/min in sintering oven is warming up to 1600 ℃ ~ 1800 ℃, and insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating;
4. grinding and polishing: Ceramic Balls is at first carried out attrition process, and the workpiece that will carry out subsequently after the attrition process polishes, and the sphericity of Ceramic Balls is no more than 0.07 micron, and surfaceness is no more than 0.008 micron.
The invention has the beneficial effects as follows: the invention provides a kind of preparation method of silicon nitride toughening ceramic ball, comprise the step of ceramic raw material preparation, base shaping, sintering and grinding and polishing, described ceramic raw material by mass percentage, is comprised of following component: β-Si
3N
4: 65% ~ 85%, SiC whisker: 10% ~ 25%, sintering aid: 5% ~ 10%.This preparation method can be implemented in sintered silicon nitride ceramic ball under the normal pressure, and step is simple, convenient and easy simultaneously.The intensity of utilizing the method to prepare is high, compactness is good, toughness obviously improves, and high temperature resistant and wear-resisting excellence, can be widely used as the rolling body of bearing.
Embodiment
Following non-limiting example can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
Embodiment 1
1. ceramic raw material preparation: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, the powder after sieving is placed ball mill, in speed ball milling 6h ~ 10h of 300 ~ 360/min,
Described ceramic raw material by mass percentage, is comprised of following component:
β-Si
3N
4 75%
SiC whisker 20%
Sintering aid 5%.
Described sintering aid by mass percentage, is comprised of following component:
Al
2O
3 60%
MgO 20%
Y
2O
3 20%。
2. press forming: with step 1. the gained powder place grinding tool, adopt the method for isostatic cool pressing to be pressed into sphere;
3. sintering: under the normal pressure, powder is placed mould, the speed with 80 ℃/min in sintering oven is warming up to 1700 ℃, and insulation 1h cools to room temperature with the furnace behind the stopped heating;
4. grinding and polishing: Ceramic Balls is at first carried out attrition process, and the workpiece that will carry out subsequently after the attrition process polishes 0.05 micron of the sphericity of Ceramic Balls, 0.005 micron of surfaceness.
Claims (7)
1. the preparation method of a silicon nitride toughening ceramic ball is characterized in that: comprise the step of ceramic raw material preparation, base shaping, sintering and grinding and polishing, undertaken by following processing step:
1. ceramic raw material preparation: ceramic raw material is after drying mixed in proportion, sieve, the powder after sieving is placed the ball mill ball milling;
2. press forming: with step 1. the gained powder place grinding tool, adopt the method for isostatic cool pressing to be pressed into sphere;
3. sintering: under the normal pressure, powder is placed mould, in 1600 ℃～1800 ℃, insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating at sintering oven;
4. grinding and polishing: the gained Ceramic Balls is ground and polished;
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
β-Si
3N
4 65%~85%
SiC whisker 10% ~ 25%
Sintering aid 5% ~ 10%.
2. method according to claim 1, it is characterized in that: described sintering aid is selected from Al
2O
3, MgO, Y
2O
3, ZrO
2In at least a.
3. method according to claim 1, it is characterized in that: 1. described step is undertaken by following technique: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, the powder after sieving is placed ball mill, in speed ball milling 6h～10h of 300 ~ 360r/min.
4. method according to claim 1, it is characterized in that: 3. described step is undertaken by following technique: under the normal pressure, powder is placed mould, the speed with 60 ~ 80 ℃/min in sintering oven is warming up to 1600 ℃ ~ 1800 ℃, insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating.
5. method claimed in claim 1, it is characterized in that: 4. described step carries out as follows: Ceramic Balls is at first carried out attrition process, and the workpiece that will carry out subsequently after the attrition process polishes, the sphericity of Ceramic Balls is no more than 0.07 micron, and surfaceness is no more than 0.008 micron.
6. method according to claim 1, it is characterized in that: described ceramic raw material by mass percentage, is comprised of following component:
β-Si
3N
4 70%~80%
SiC whisker 15% ~ 25%
Sintering aid 5% ~ 10%.
7. method according to claim 1, it is characterized in that: described method comprises following processing step:
1. ceramic raw material preparation: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, the powder after sieving is placed ball mill, in speed ball milling 6h ~ 10h of 300 ~ 360r/min;
2. press forming: with step 1. the gained powder place grinding tool, adopt the method for isostatic cool pressing to be pressed into sphere;
3. sintering: under the normal pressure, powder is placed mould, the speed with 60 ~ 80 ℃/min in sintering oven is warming up to 1600 ℃ ~ 1800 ℃, and insulation 0.5h ~ 2h cools to room temperature with the furnace behind the stopped heating;
4. grinding and polishing: Ceramic Balls is at first carried out attrition process, and the workpiece that will carry out subsequently after the attrition process polishes, and the sphericity of Ceramic Balls is no more than 0.07 micron, and surfaceness is no more than 0.008 micron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104966375A CN103011873A (en) | 2012-11-28 | 2012-11-28 | Preparation method of silicon nitride toughening ceramic ball |
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|---|---|---|---|
| CN2012104966375A CN103011873A (en) | 2012-11-28 | 2012-11-28 | Preparation method of silicon nitride toughening ceramic ball |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106747458A (en) * | 2017-01-23 | 2017-05-31 | 威海圆环先进陶瓷有限公司 | Make the production technology of silicon carbide ceramics microballon |
| CN106747473A (en) * | 2017-01-23 | 2017-05-31 | 威海圆环先进陶瓷有限公司 | Make the production technology of silicon nitride ceramics microballon |
| CN112997017A (en) * | 2018-12-11 | 2021-06-18 | 株式会社东芝 | Sliding member, and bearing, engine, and drive device using same |
| CN116003879A (en) * | 2023-01-05 | 2023-04-25 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051900A (en) * | 1990-12-29 | 1991-06-05 | 清华大学 | Silicon nitride compound phase ceramic knife tool material with whiskers for supplementing toughness and strength |
| CN102276260A (en) * | 2011-06-09 | 2011-12-14 | 中国科学院唐山高新技术研究与转化中心 | Atmospheric-pressure and low-temperature sintering method of beta-silicon nitride ceramic |
| CN102627459A (en) * | 2011-06-14 | 2012-08-08 | 李东炬 | Production technology of high-precision high-speed ceramic roller |
-
2012
- 2012-11-28 CN CN2012104966375A patent/CN103011873A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051900A (en) * | 1990-12-29 | 1991-06-05 | 清华大学 | Silicon nitride compound phase ceramic knife tool material with whiskers for supplementing toughness and strength |
| CN102276260A (en) * | 2011-06-09 | 2011-12-14 | 中国科学院唐山高新技术研究与转化中心 | Atmospheric-pressure and low-temperature sintering method of beta-silicon nitride ceramic |
| CN102627459A (en) * | 2011-06-14 | 2012-08-08 | 李东炬 | Production technology of high-precision high-speed ceramic roller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106747458A (en) * | 2017-01-23 | 2017-05-31 | 威海圆环先进陶瓷有限公司 | Make the production technology of silicon carbide ceramics microballon |
| CN106747473A (en) * | 2017-01-23 | 2017-05-31 | 威海圆环先进陶瓷有限公司 | Make the production technology of silicon nitride ceramics microballon |
| CN112997017A (en) * | 2018-12-11 | 2021-06-18 | 株式会社东芝 | Sliding member, and bearing, engine, and drive device using same |
| CN116003879A (en) * | 2023-01-05 | 2023-04-25 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
| CN116003879B (en) * | 2023-01-05 | 2023-12-22 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
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Inventor after: Li Dongju Inventor before: Li Dongju Inventor before: Zhen Hengzhou |
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Free format text: CORRECT: INVENTOR; FROM: LI DONGJU ZHEN HENGZHOU TO: LI DONGJU |
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Application publication date: 20130403 |