CN103848630A - High density composite ceramic balls - Google Patents
High density composite ceramic balls Download PDFInfo
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- CN103848630A CN103848630A CN201210496280.0A CN201210496280A CN103848630A CN 103848630 A CN103848630 A CN 103848630A CN 201210496280 A CN201210496280 A CN 201210496280A CN 103848630 A CN103848630 A CN 103848630A
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Abstract
The invention relates to high density composite ceramic balls, which belongs to the bearing rolling element preparation field. According to the high density composite ceramic balls, the relative density of the ceramic is 98.5-99.3%, the fracture toughness is 7.2MPa.m<1/2>-8.7MPa.m<1/2>, the Vickers hardness is 20.0GPa-21.6GPa, the thermal conductivity is 126-144W/(m.K), the sphericity is less than or equal to 0.07mum, and the surface roughness is less than or equal to 0.008mum. The composite ceramic has the advantages of low intensity, high thermal conductivity, high hardness, low friction coefficient, wear resistance, good self lubricating and rigidity, and can be widely used as a rolling element of a bearing.
Description
Technical field
The present invention relates to a kind of high fine and close composite ceramics ball, belong to bearing roller preparation field.
Background technology
Ball bearing is the one of rolling bearing, and 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 features 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.
Cubic boron nitride ceramic all has good thermotolerance, thermostability, thermal conductivity, is desirable heat sink material and high temperature insulating material.The chemical stability of boron nitride is good, can resist the etch of most of molten metal.It also has good self lubricity.But its hardness is low compared with other high-strength ceramics, be applicable to make high-temperature bearing.But the sintering condition of cubic boron nitride ceramic is extremely harsh, in order to reduce its sintering temperature and condition, need in sintering process, add other sintering aids.
It is very high and extremely high temperature resistant that silicon nitride ceramics has high intensity, and its intensity does not decline at the high temperature of 1200 ℃, after being heated, can not be melt into and melt body, simultaneously, its resistance to chemical corrosion excellence, the caustic soda soln below the mineral acid that ability is nearly all and 30%, 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 70Mpa left and right, and the pressure of the sintering of hot isostatic pressing is 150MPa ~ 200MPa.
In order to strengthen thermal conductivity and the self lubricity of silicon nitride ceramics, a kind of multiphase composite material need to be provided, and reduce sintering pressure, realize pressureless sintering.
Summary of the invention
The object of this invention is to provide a kind of high-compactness composite ceramics ball, this silicon nitride ceramic ball has that low density, thermal conductivity are high, high rigidity, low-friction coefficient, and wear-resisting, self-lubricating and good rigidly etc. can be widely used as the rolling body of bearing.
A kind of high-compactness composite ceramics ball, the relative density of described Ceramic Balls is 98.5% ~ 99.3%, fracture toughness property is 7.2MPam
1/2~ 8.7MPam
1/2, Vickers' hardness is 20.0GPa ~ 21.6GPa, thermal conductivity is 126 ~ 144W/(mK) sphericity≤0.07 μ m, surfaceness≤0.008 μ m.
The relative density of the preferred described Ceramic Balls of high-compactness composite ceramics ball of the present invention is 98.8% ~ 99.0%, fracture toughness property is 7.6MPam
1/2~ 8.0MPam
1/2, Vickers' hardness is 20.0GPa ~ 20.7GPa, thermal conductivity is 135 ~ 144W/(mK) sphericity≤0.05 μ m, surfaceness≤0.005 μ m.
The relative density of the preferred described Ceramic Balls of high-compactness composite ceramics ball of the present invention is 99.0%, fracture toughness property is 7.6MPam
1/2, Vickers' hardness is 20.7GPa, thermal conductivity is 144W/(mK) sphericity is 0.05 μ m, surfaceness is 0.005 μ m.
High-compactness composite ceramics ball of the present invention is preparation as follows preferably:
A preparation method for high fine and close composite ceramics 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 in to ball mill ball milling;
2. press forming: by step 1. gained powder be placed in grinding tool, adopt the method for isostatic cool pressing to be pressed into spherical;
3. sintering: in nitrogen atmosphere, powder is placed in to mould, at 1500 ℃ ~ 1750 ℃ insulation 2h ~ 6h, stops cooling to room temperature with the furnace after heating;
4. grinding and polishing: gained Ceramic Balls is ground and polishing;
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
Described in preparation method's preferably ceramic of the fine and close composite ceramics ball of height of the present invention, 1. step is undertaken by following technique: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves, powder after sieving is placed in to ball mill, in speed ball milling 2h ~ 6h of 300 ~ 360r/min.
3. the preferred described step of preparation method of the fine and close composite ceramics ball of height of the present invention is undertaken by following technique: in nitrogen atmosphere, powder is placed in to mould, in sintering oven, be warming up to 1500 ℃ ~ 1750 ℃ with the speed of 10 ~ 20 ℃/min, insulation 2h ~ 6h, stop cooling to room temperature with the furnace after heating, wherein nitrogen flow rate is 1 ~ 5L/min.
The preferred described step of preparation method of the fine and close composite ceramics ball of height of the present invention 4., carry out as follows: first Ceramic Balls is carried out to attrition process, subsequently the workpiece carrying out after attrition process is carried out to polishing, 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 preparation method of the fine and close composite ceramics ball of height of the present invention, by mass percentage, is made up of following component:
The further preferred following proposal of the preparation method of the fine and close composite ceramics ball of height of the present invention:
A preparation method for high fine and close composite ceramics 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 in to ball mill, in speed ball milling 2h ~ 6h of 300 ~ 360r/min;
2. press forming: by step 1. gained powder be placed in grinding tool, adopt the method for isostatic cool pressing to be pressed into spherical;
3. sintering: in nitrogen atmosphere, powder is placed in to mould, is warming up to 1500 ℃ ~ 1750 ℃ with the speed of 10 ~ 20 ℃/min in sintering oven, insulation 2h ~ 6h, stops cooling to room temperature with the furnace after heating, and wherein nitrogen flow rate is 1 ~ 5L/min;
4. grinding and polishing: first Ceramic Balls is carried out to attrition process, subsequently the workpiece carrying out after attrition process is carried out to polishing, 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 high-compactness composite ceramics ball, the relative density of described pottery is 98.5% ~ 99.3%, fracture toughness property is 7.2MPam
1/2~ 8.7MPam
1/2, Vickers' hardness is 20.0GPa ~ 21.6GPa, thermal conductivity is 126～144W/(mK) sphericity≤0.07 μ m, surfaceness≤0.008 μ m.This silicon nitride ceramic ball has that low density, thermal conductivity are high, high rigidity, low-friction coefficient, and wear-resisting, self-lubricating and good rigidly etc. can be widely used as the rolling body of bearing.
Meanwhile, provide a kind of preparation method of high fine and close composite ceramics ball, comprise the step of ceramic raw material preparation, base shaping, sintering and grinding and polishing, by mass percentage, formed by following component: β-Si
3n
4: 70% ~ 90%, AlN:5% ~ 25%, BN:1% ~ 3%, Y
2o
3: 0.1% ~ 1%, CaF
2: 0.1% ~ 1%.This preparation method can realize sintered silicon nitride-aluminium nitride under normal pressure-cubic boron nitride composite ceramics ball, and step is simple, convenient and easy simultaneously.
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 120 mesh sieves, the powder after sieving is placed in to ball mill, in the speed ball milling 5h of 300r/min;
2. press forming: by step 1. gained powder be placed in grinding tool, adopt the method for isostatic cool pressing to be pressed into spherical;
3. sintering: in nitrogen atmosphere, powder is placed in to mould, is warming up to 1750 ℃ with the speed of 15 ℃/min in sintering oven, insulation 3h, stops cooling to room temperature with the furnace after heating, and wherein nitrogen flow rate is 2L/min;
4. grinding and polishing: first Ceramic Balls is carried out to attrition process, subsequently the workpiece carrying out after attrition process is carried out to polishing, the sphericity of Ceramic Balls is 0.05 micron, and surfaceness is 0.005 micron.
The relative density of gained Ceramic Balls is 99.0%, fracture toughness property is 7.6MPam
1/2, Vickers' hardness is 20.7GPa, thermal conductivity is 144W/(mK) sphericity is 0.05 μ m, surfaceness is 0.005 μ m.
Claims (6)
1. a high-compactness composite ceramics ball, is characterized in that: the relative density of described Ceramic Balls is 98.5% ~ 99.3%, fracture toughness property is 7.2MPam
1/2~ 8.7MPam
1/2, Vickers' hardness is 20.0GPa ~ 21.6GPa, thermal conductivity is 126 ~ 144W/(mK) sphericity≤0.07 μ m, surfaceness≤0.008 μ m.
2. Ceramic Balls according to claim 1, is characterized in that: the relative density of described Ceramic Balls is 98.8% ~ 99.0%, fracture toughness property is 7.6MPam
1/2~ 8.0MPam
1/2, Vickers' hardness is 20.0GPa ~ 20.7GPa, thermal conductivity is 135 ~ 144W/(mK) sphericity≤0.05 μ m, surfaceness≤0.005 μ m.
3. Ceramic Balls according to claim 1, is characterized in that: the relative density of described Ceramic Balls is 99.0%, fracture toughness property is 7.6MPam
1/2, Vickers' hardness is 20.7GPa, thermal conductivity is 144W/(mK) sphericity is 0.05 μ m, surfaceness is 0.005 μ m.
4. Ceramic Balls according to claim 1, is characterized in that: the preparation method of described Ceramic Balls, 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 in to ball mill ball milling;
2. press forming: by step 1. gained powder be placed in grinding tool, adopt the method for isostatic cool pressing to be pressed into spherical;
3. sintering: in nitrogen atmosphere, powder is placed in to mould, at 1500 ℃ ~ 1750 ℃ insulation 2h ~ 6h, stops cooling to room temperature with the furnace after heating;
4. grinding and polishing: gained Ceramic Balls is ground and polishing;
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
5. Ceramic Balls according to claim 4, is characterized in that: described ceramic raw material, by mass percentage, is made up of following component:
6. Ceramic Balls according to claim 4, is characterized in that: comprise 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 in to ball mill, in speed ball milling 2h ~ 6h of 300 ~ 360r/min;
2. press forming: by step 1. gained powder be placed in grinding tool, adopt the method for isostatic cool pressing to be pressed into spherical;
3. sintering: in nitrogen atmosphere, powder is placed in to mould, is warming up to 1500 ℃ ~ 1750 ℃ with the speed of 10 ~ 20 ℃/min in sintering oven, insulation 2h ~ 6h, stops cooling to room temperature with the furnace after heating, and wherein nitrogen flow rate is 1 ~ 5L/min;
4. grinding and polishing: first Ceramic Balls is carried out to attrition process, subsequently the workpiece carrying out after attrition process is carried out to polishing, 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 |
|---|---|---|---|
| CN201210496280.0A CN103848630A (en) | 2012-11-28 | 2012-11-28 | High density composite ceramic balls |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496280.0A CN103848630A (en) | 2012-11-28 | 2012-11-28 | High density composite ceramic balls |
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| CN103848630A true CN103848630A (en) | 2014-06-11 |
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ID=50856801
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|---|---|---|---|
| CN201210496280.0A Pending CN103848630A (en) | 2012-11-28 | 2012-11-28 | High density composite ceramic balls |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106957176A (en) * | 2016-01-12 | 2017-07-18 | 河北高富氮化硅材料有限公司 | A kind of preparation method of high thermal conductivity silicon nitride ceramics |
-
2012
- 2012-11-28 CN CN201210496280.0A patent/CN103848630A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106957176A (en) * | 2016-01-12 | 2017-07-18 | 河北高富氮化硅材料有限公司 | A kind of preparation method of high thermal conductivity silicon nitride ceramics |
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Application publication date: 20140611 |