CN103848627A - Silicon nitride ceramic - Google Patents
Silicon nitride ceramic Download PDFInfo
- Publication number
- CN103848627A CN103848627A CN201210496152.6A CN201210496152A CN103848627A CN 103848627 A CN103848627 A CN 103848627A CN 201210496152 A CN201210496152 A CN 201210496152A CN 103848627 A CN103848627 A CN 103848627A
- Authority
- CN
- China
- Prior art keywords
- silicon nitride
- pottery
- raw material
- sintering
- ceramic raw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Ceramic Products (AREA)
Abstract
The invention relates to a silicon nitride ceramic, which belongs to the ceramic preparation field. According to the silicon nitride ceramic, the relative density of the ceramic is 98.8-99.5%, the fracture toughness is 8.0MPa.ml/2-9.2MPa.m1/2, the Vickers hardness is 20.5-21.5 GPa. The silicon nitride ceramic has the advantages of high strength, good compactness, excellent high temperature and wear resistance, and can be widely used for various fields with high strength requirements of the material, and is especially suitable for making a bearing rolling element.
Description
Technical field
The present invention relates to a kind of silicon nitride ceramics, belong to ceramic preparation field.
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 ℃, 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.
Heat and other static pressuring processes is that goods are placed in airtight container, applies respectively to equal pressure to goods, 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 adds flanging heating from single shaft direction limit, 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.But 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 the method for ceramic body being carried out in the burner hearth that passes into certain gas to sintering, and its sintering pressure is 5 ~ 10MPa.
Summary of the invention
The object of this invention is to provide a kind of silicon nitride ceramics, this silicon nitride ceramics intensity 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, is particularly useful for making bearing roller.
A kind of silicon nitride ceramics, the relative density of described pottery is 98.8% ~ 99.5%, fracture toughness property is 8.0MPam
1/2~ 9.2MPam
1/2, Vickers' hardness is 20.5GPa ~ 21.5GPa.
The relative density of the preferred described pottery of silicon nitride ceramics of the present invention is 99.0% ~ 99.5%, fracture toughness property is 8.6MPam
1/2~ 9.2MPam
1/2, Vickers' hardness is 21GPa ~ 21.5GPa.
The relative density of the preferred described pottery of silicon nitride ceramics of the present invention is 99.2%, fracture toughness property is 8.9MPam
1/2, Vickers' hardness is 21.3GPa.
Silicon nitride ceramics of the present invention is preparation as follows preferably:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in speed ball milling 6h ~ 10h of 300 ~ 360r/min;
3. sintering: under normal pressure, powder is placed in to mould, is warming up to 1600 ℃ ~ 1650 ℃ with the speed of 60 ~ 80 ℃/min in sintering oven, insulation 0.5h ~ 2h, stops cooling to room temperature with the furnace after heating.
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
The preferred described ceramic raw material of preparation method of silicon nitride ceramics of the present invention, by mass percentage, is made up of following component:
The preparation method of silicon nitride ceramics of the present invention is preferred described ceramic raw material further, by mass percentage, is made up of following component:
The invention has the beneficial effects as follows: the invention provides a kind of silicon nitride ceramics, this ceramic relative density is 98.8% ~ 99.5%, fracture toughness property is 8.0MPam
1/2~ 9.2MPam
1/2, Vickers' hardness is 20.5GPa ~ 21.5GPa.This silicon nitride ceramics intensity 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, is particularly useful for making bearing roller.
The present invention provides a kind of preparation method of silicon nitride ceramics simultaneously, comprises the step of batch mixing, ball milling and sintering, and described ceramic raw material by mass percentage, is made up of following component: β-Si
3n
4: 80% ~ 95%, Al
2o
3: 2% ~ 15%, MgO:1% ~ 12%, Y
2o
3: 1% ~ 12%, ZrO
2: 1% ~ 12%.This preparation method can realize sintered silicon nitride ceramic under normal pressure, 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. batch mixing: ceramic raw material is after drying mixed in proportion, cross 200 mesh sieves, described ceramic raw material, by mass percentage, is made up of following component:
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in the speed ball milling 8h of 300r/min;
3. sintering: under normal pressure, powder is placed in to mould, is warming up to 1600 ℃ with the speed of 60 ℃/min in sintering oven, insulation 1h, stops cooling to room temperature with the furnace after heating.
The relative density of gained pottery is 99.2%, fracture toughness property is 8.9MPam
1/2, Vickers' hardness is 21.3GPa.
Claims (6)
1. a silicon nitride ceramics, is characterized in that: the relative density of described pottery is 98.8% ~ 99.5%, fracture toughness property is 8.0MPam
1/2~ 9.2MPam
1/2, Vickers' hardness is 20.5GPa ~ 21.5GPa.
2. pottery according to claim 1, is characterized in that: the relative density of described pottery is 99.0% ~ 99.5%, fracture toughness property is 8.6MPam
1/2~ 9.2MPam
1/2, Vickers' hardness is 21GPa ~ 21.5GPa.
3. pottery according to claim 1, is characterized in that: the relative density of described pottery is 99.2%, fracture toughness property is 8.9MPam
1/2, Vickers' hardness is 21.3GPa.
4. pottery according to claim 1, is characterized in that: described pottery is prepared as follows:
1. batch mixing: ceramic raw material is after drying mixed in proportion, cross 80 ~ 200 mesh sieves;
2. ball milling: under normal temperature, the powder through batch mixing is placed in to ball mill, in speed ball milling 6h ~ 10h of 300 ~ 360r/min;
3. sintering: under normal pressure, powder is placed in to mould, is warming up to 1600 ℃ ~ 1650 ℃ with the speed of 60 ~ 80 ℃/min in sintering oven, insulation 0.5h ~ 2h, stops cooling to room temperature with the furnace after heating.
Wherein, step 1. described in ceramic raw material, by mass percentage, formed by following component:
5. pottery according to claim 4, is characterized in that: described ceramic raw material, by mass percentage, is made up of following component:
6. pottery according to claim 4, is characterized in that: described ceramic raw material, by mass percentage, is made up of following component:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496152.6A CN103848627A (en) | 2012-11-28 | 2012-11-28 | Silicon nitride ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496152.6A CN103848627A (en) | 2012-11-28 | 2012-11-28 | Silicon nitride ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103848627A true CN103848627A (en) | 2014-06-11 |
Family
ID=50856798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210496152.6A Pending CN103848627A (en) | 2012-11-28 | 2012-11-28 | Silicon nitride ceramic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103848627A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104926317A (en) * | 2015-06-01 | 2015-09-23 | 广东工业大学 | High-toughness Si3N4 ceramic preparation method |
| CN107651965A (en) * | 2017-11-15 | 2018-02-02 | 石家庄铁道大学 | A kind of silicon nitride ceramic material and preparation method thereof |
| CN108675798A (en) * | 2018-08-03 | 2018-10-19 | 广东工业大学 | A kind of silicon nitride ceramics and preparation method thereof |
| CN115551818A (en) * | 2020-05-07 | 2022-12-30 | Ａｇｃ株式会社 | Method for producing ceramic sintered body and ceramic sintered body |
| EP4365152A3 (en) * | 2015-09-29 | 2024-07-10 | The Penn State Research Foundation | Cold sintering ceramics and composites |
-
2012
- 2012-11-28 CN CN201210496152.6A patent/CN103848627A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104926317A (en) * | 2015-06-01 | 2015-09-23 | 广东工业大学 | High-toughness Si3N4 ceramic preparation method |
| EP4365152A3 (en) * | 2015-09-29 | 2024-07-10 | The Penn State Research Foundation | Cold sintering ceramics and composites |
| CN107651965A (en) * | 2017-11-15 | 2018-02-02 | 石家庄铁道大学 | A kind of silicon nitride ceramic material and preparation method thereof |
| CN108675798A (en) * | 2018-08-03 | 2018-10-19 | 广东工业大学 | A kind of silicon nitride ceramics and preparation method thereof |
| CN115551818A (en) * | 2020-05-07 | 2022-12-30 | Ａｇｃ株式会社 | Method for producing ceramic sintered body and ceramic sintered body |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106518089B (en) | A kind of preparation method of high performance and big size silicon nitride ceramic material | |
| CN102173813B (en) | Preparation method of complex phase ceramic material containing zirconium boride | |
| CN103601473B (en) | A kind of high purity, high-compactness magnesia ceramics | |
| CN103848627A (en) | Silicon nitride ceramic | |
| CN102276260B (en) | Atmospheric-pressure and low-temperature sintering method of beta-silicon nitride ceramic | |
| CN105859301B (en) | A kind of silicon nitride ceramics and preparation method thereof | |
| CN101691300B (en) | Large-size medium-grained graphite material and production process thereof | |
| CN102442819A (en) | Method for preparing high-performance large aluminum oxide product at low cost | |
| CN102795860A (en) | Method for preparing silicon nitride ceramic balls | |
| CN110218924A (en) | A kind of preparation method of high-performance diamond sintered article | |
| CN114736022B (en) | High-density, high-strength and ultrahigh-hardness boron carbide/high-entropy diboride complex phase ceramic and preparation method thereof | |
| CN114318038A (en) | Boride modified Mo2FeB2Base cermet and method for preparing same | |
| CN101508572B (en) | Quick production method for high-compact single-phase TiB2 | |
| CN103011872A (en) | Preparation method of silicon nitride toughening ceramic | |
| CN104446459B (en) | Preparation method for the Bubble zirconia insulating product of tungsten sintering intermediate frequency furnace | |
| CN103011834A (en) | Preparation method for high-compactness composite ceramic | |
| CN105565815A (en) | Method for preparing porous titanium nitride ceramics | |
| CN103030398A (en) | Preparation method of silicon nitride ceramic | |
| CN103058663A (en) | Preparation method of silicon nitride ceramic balls | |
| CN104609864B (en) | A kind of method utilizing ferro-silicon nitride powder to prepare block body ceramic material | |
| CN102392149B (en) | Method for microwave sintering preparation of nano-metric rare earth modified steel-bonded hard alloy | |
| CN101209925A (en) | Modified method for aluminum oxide/titanium oxide diphase fine ceramic material | |
| CN100577609C (en) | Yttrium oxide doping lithium fluoride crucible and producing method thereof by using hot pressing sintering | |
| CN101239834B (en) | Yttrium oxide doping zirconium oxide crucible and producing method thereof by using hot pressing sintering | |
| CN106654248A (en) | Preparation method of high-purity manganese monoxide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140611 |