CN104193343A - Method for preparing silicon nitride ceramic - Google Patents
Method for preparing silicon nitride ceramic Download PDFInfo
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- CN104193343A CN104193343A CN201410420239.4A CN201410420239A CN104193343A CN 104193343 A CN104193343 A CN 104193343A CN 201410420239 A CN201410420239 A CN 201410420239A CN 104193343 A CN104193343 A CN 104193343A
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- silicon nitride
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Abstract
The invention relates to a method for preparing silicon nitride ceramic. The method comprises the following steps: mixing, namely, uniformly mixing dried ceramic raw materials according to a ratio, and screening with a 100-300 mesh sieve; ball-milling, namely, putting the mixed powder material into a ball mill at normal temperature, and ball-milling for 4-14 hours at the speed of 120-180r/minute; and sintering, namely, putting the powder material into a mold at normal pressure, heating to be 800-1900 DEG C at the speed of 40-80 DEG C/minute in a sintering furnace, keeping the temperature for 2-5 hours, stopping heating, and cooling to be the room temperature along with the furnace. By adopting the method provided by the invention, silicon nitride ceramic sintering at normal pressure can be achieved, and meanwhile the steps are simple, convenient and feasible. The silicon nitride ceramic which is prepared by using the method is high in strength, good in density, resistant to high temperature and excellent in wearing resistance, and can be widely applied to various fields with high requirements on strength of materials.
Description
Technical field
The present invention is specifically related to a kind of preparation method of silicon nitride ceramics.
Background technology
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 ℃, is subject to
After heat, can not be melt into and melt body, meanwhile, its resistance to chemical corrosion is excellent, 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.
Heat and other static pressuring processes is that goods are placed in airtight container, to goods, applies each to equal pressure, imposes high temperature simultaneously, and under the effect of High Temperature High Pressure, goods are able to sintering and densification.Hot isostatic pressing is powder compacting directly, and powder packs mould into, then uses nitrogen, argon gas to make pressure medium, makes the powder metallurgical technique of powder direct heating pressure sintering moulding, and the pressure of its sintering is 150MPa ~ 200MPa.
Hot pressed sintering is that dry powder is filled in model, then from single shaft direction limit, adds flanging heating, and pressure is about 70Mpa, a kind of sintering method that moulding and sintering are completed simultaneously.The method has reduction sintering temperature, shortens sintering time, resists grain growth, obtains that crystal grain is tiny, density is high and the advantage of mechanical, electric property is good product.Yet its sintering pressure is high, and process and equipment complexity, production control requires tight, and moulding stock requires high, and energy consumption is large, and production efficiency is lower, and production cost is high.
Atmosphere sintering is ceramic body to be carried out in passing into the burner hearth of certain gas to the method for sintering, and its sintering pressure is 5 ~ 10MPa.
Summary of the invention
Goal of the invention: the present invention is directed to deficiency, propose a kind of preparation method of silicon nitride ceramics.
Technical scheme: the preparation method of a kind of silicon nitride ceramics of the present invention, comprises following processing step:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 100 ~ 300 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling of 120-180r/min
4h~14h；
3. sintering: under normal pressure, powder is placed in to mould, the speed with 40-80 ℃/min in sintering oven is warming up to
800 ℃ ~ 1900 ℃, insulation 2h ~ 5h, stops cooling to room temperature with the furnace after heating.
As optimization: 1. described step in batch mixing, crosses 200 mesh sieves.
As optimization: described step is 2. in ball milling, the speed ball milling of 150r/min.
As optimization: described step is 2. in ball milling, and Ball-milling Time is 10h.
As optimization: described step is 3. in sintering, and the speed with 60 ℃/min in sintering oven is warming up to 1200 ℃, insulation 4h.
Beneficial effect: preparation method of the present invention can realize sintered silicon nitride ceramic under normal pressure, step is simple, convenient and easy simultaneously.The silicon nitride ceramics intensity of utilizing the method to prepare is high, compactness good, high temperature resistant and wear-resisting excellence, can be widely used in various the strength of materials to be required to high field.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
A preparation method for silicon nitride ceramics, comprises following processing step:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 100 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling 4h of 120r/min;
3. sintering: under normal pressure, powder is placed in to mould, the speed with 40 ℃/min in sintering oven is warming up to 800 ℃, insulation 2h, stops cooling to room temperature with the furnace after heating.
Embodiment 2
A preparation method for silicon nitride ceramics, comprises following processing step:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 300 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling 14h of 180r/min;
3. sintering: under normal pressure, powder is placed in to mould, the speed with 80 ℃/min in sintering oven is warming up to 1900 ℃, insulation 5h, stops cooling to room temperature with the furnace after heating.
Embodiment 3
A preparation method for silicon nitride ceramics, comprises following processing step:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 200 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling 10h of 150r/min;
3. sintering: under normal pressure, powder is placed in to mould, the speed with 60 ℃/min in sintering oven is warming up to 1200 ℃, insulation 4h, stops cooling to room temperature with the furnace after heating.
Above-described embodiment does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (5)
1. a preparation method for silicon nitride ceramics, is characterized in that: comprise following processing step:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 100 ~ 300 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling of 120-180r/min
4h~14h；
3. sintering: under normal pressure, powder is placed in to mould, the speed with 40-80 ℃/min in sintering oven is warming up to
800 ℃ ~ 1900 ℃, insulation 2h ~ 5h, stops cooling to room temperature with the furnace after heating.
2. the preparation method of silicon nitride ceramics according to claim 1, is characterized in that: 1. described step in batch mixing, crosses 200 mesh sieves.
3. the preparation method of silicon nitride ceramics according to claim 1, is characterized in that: described step is 2. in ball milling, the speed ball milling of 150r/min.
4. the preparation method of silicon nitride ceramics according to claim 1, is characterized in that: described step is 2. in ball milling, and Ball-milling Time is 10h.
5. the preparation method of silicon nitride ceramics according to claim 1, is characterized in that: described step is 3. in sintering, and the speed with 60 ℃/min in sintering oven is warming up to 1200 ℃, insulation 4h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410420239.4A CN104193343A (en) | 2014-08-25 | 2014-08-25 | Method for preparing silicon nitride ceramic |
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| CN201410420239.4A CN104193343A (en) | 2014-08-25 | 2014-08-25 | Method for preparing silicon nitride ceramic |
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| CN104193343A true CN104193343A (en) | 2014-12-10 |
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| CN201410420239.4A Pending CN104193343A (en) | 2014-08-25 | 2014-08-25 | Method for preparing silicon nitride ceramic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104744047A (en) * | 2015-03-04 | 2015-07-01 | 烟台同立高科新材料股份有限公司 | Method for preparing silicon nitride crucible through reactive sintering |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030398A (en) * | 2012-11-28 | 2013-04-10 | 大连大友高技术陶瓷有限公司 | Preparation method of silicon nitride ceramic |
| CN103524142A (en) * | 2013-10-22 | 2014-01-22 | 山东建筑大学 | Preparation method of silicon nitride-silicon carbide-titanium carbide micro-nano composite material |
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2014
- 2014-08-25 CN CN201410420239.4A patent/CN104193343A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030398A (en) * | 2012-11-28 | 2013-04-10 | 大连大友高技术陶瓷有限公司 | Preparation method of silicon nitride ceramic |
| CN103524142A (en) * | 2013-10-22 | 2014-01-22 | 山东建筑大学 | Preparation method of silicon nitride-silicon carbide-titanium carbide micro-nano composite material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104744047A (en) * | 2015-03-04 | 2015-07-01 | 烟台同立高科新材料股份有限公司 | Method for preparing silicon nitride crucible through reactive sintering |
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Application publication date: 20141210 |