CN85104097A - Boron nitride fiber reinforced reactively sintered silicon nitride ceramics - Google Patents
Boron nitride fiber reinforced reactively sintered silicon nitride ceramics Download PDFInfo
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- CN85104097A CN85104097A CN198585104097A CN85104097A CN85104097A CN 85104097 A CN85104097 A CN 85104097A CN 198585104097 A CN198585104097 A CN 198585104097A CN 85104097 A CN85104097 A CN 85104097A CN 85104097 A CN85104097 A CN 85104097A
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- boron nitride
- silicon nitride
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Abstract
A kind of matrix material that belongs to inorganic fibre reinforcement pottery is to use boron nitride fiber reinforced reactively sintered silicon nitride ceramics, has than low-k and dielectric loss; Advantages such as ablation resistance is good are suitable for high temperature and use, and manufacture craft are simple, and cost is lower.The heat-shock resistance of this material is better than general pottery or glass antenna window material greatly, therefore is more suitable for using under the occasion of big thermal shocking.Material provided by the invention contains 5～20% (weight) boron nitride fibre, and the preferential fibre content of selecting is 8～17% (weight), and all the other are silicon nitride and impurity.
Description
The present invention is the matrix material that belongs to a kind of inorganic fibre reinforcement ceramic matrix.This matrix material has lower specific inductivity and dielectric loss, has fabulous heat-shock resistance ablation resistance, is suitable for making the high temperature antenna windows.
Antenna windows is to the attitude of control space vehicle and make aircraft hit accurately that giving sets the goal plays keying action.Requirement to this antenna windows is low, high temperature resistant, anti-ablation of good thermal shock, dielectric properties and suitable mechanical property.Common ceramic antenna window material or glass antenna window material, as (U.S. AD-A007956) such as quartz, silicon nitride, aluminum oxide, boron nitride, beryllium oxide, devitrified glasses, because heat-shock resistance is relatively poor, all can not in the environment of rapid variation of temperature and extreme temperatures, use.2000 ℃ of (combustion chamber pressure 15 kilograms per centimeter such as silicon nitride, quartz for example
2, oxygen-gas flame) and test all seriously cracking under the condition.In order to remedy the existing relatively poor shortcoming of high temperature antenna windows heat-shock resistance, antenna windows can only be installed in the low and less position of temperature variation of aircraft temperature.Tend to make the control circuit of aircraft complicated but install like this, make the weight distribution imbalance (for balance will increase unnecessary weight) of aircraft, make aircraft influence the accuracy and the accuracy at target of remote control in some time appearance " blind area ".
People (Journal of the American Ceramic Society such as K, S, MAZDIYASNI, Vol64, No.7,1981, pp.415～419) having studied in high strength, high-modulus silicon nitride ceramics body material with low modulus close grain BN is disperse phase, form matrix material, improve electrical property and thermal shock resistance properties.What adopt is heat pressing process, and complex process should not be made big goods.The inventor was disperse phase reinforcement Si with fine particle BN once
3N
4Pottery adopts technologies such as reaction sintering, hot pressing to make matrix material, tests all seriously cracking under above-mentioned 2000 ℃ of conditions.
The object of the present invention is to provide a kind of matrix material with inorganic fibre reinforcement pottery.This matrix material has heat-shock resistance and is better than general pottery or glass antenna window material greatly, and dielectric properties are low, dielectric loss is little, ablation resistance is good, is convenient to advantages such as preservation and manufacture craft are simple, cost is lower.Therefore be more suitable under the occasion of big thermal shocking, using.
Matrix material provided by the invention contains 5～20%(weight) boron nitride fibre, surplus is silicon nitride and impurity, contains 8～17%(weight for the preferential matrix material of selecting) boron nitride fibre.
The manufacture method of matrix material provided by the invention is earlier boron nitride fibre to be mixed with silica flour, and moulding is carried out reaction sintering then in logical nitrogen stove, makes silicon and nitrogen reaction in the base substrate generate silicon nitride, makes matrix material fixed.Preservation and protection against the tide for the ease of matrix material are coated with redoubling through solidification treatment at composite material surface with special organic materials.
The advantage of matrix material manufacturing of the present invention be molding biscuit after giving nitrogenize, can be machined into complex-shaped base substrate, (reaction sintering) had only about 0.1% linear shrinkage when finished base substrate advanced nitrogenize for the second time again.So the attrition process amount of goods seldom, and cost is lower.
Table 1 is that boron nitride fibre content is 10%(weight) performance of composites.
An example of the performance of table 1 boron nitride fibre excess weld metal silicon nitride ceramic composite
The performance performance data
1. boron nitride fibre content (weight %) 10
2. density (gram per centimeter
3) 2.16
3. specific inductivity (9375MHZ) 3.96
4. dielectric loss (9375MHZ) 6.65 * 10
-3
5. ablation rate
(1) oxygen-gas flame: about 2000 ℃ of temperature, combustion chamber pressure 15 kilograms per centimeter
2
Line ablation (mm/second) 0.011-0.04
Matter ablation (Grams Per Second) 0.312
(2) arc stagnation point ablation: arc chamber gaseous tension 5.1 kilograms per centimeter
2, the gas value
2460 kilocalories/kilogram
Line ablation (mm/second) 0.616
Matter ablation (Grams Per Second) 0.229
6. heat-shock resistance *
(1) oxygen-gas flame does not split
(2) arc stagnation point ablation does not split
7. bending strength (MPa) 57.0
8. tensile strength (MPa) 27.0
9. tension strain (%) 0.14
10. Young's modulus (MPa) 7.6 * 10
4
11. work of rupture (joules per meter
2) 38.5
12. thermal diffusivity (centimetre
2/ second) 0.0479(360 ℃)
0.0322（713℃）
0.0256（1070℃）
0.0236（1265℃）
13. 0.1784(77 ℃ of specific heat (card/gram ℃))
0.2166（197℃）
0.2398（317℃）
0.2544（437℃）
14. 0.0277(332 ℃ of thermal conductivity (card/second centimetre ℃))
0.0247（524℃）
15. thermal expansivity (/ ℃)
(room temperature-500 ℃) 2.41 * 10
-6
(room temperature-1200 ℃) 2.88 * 10
-6
* test conditions is identical with the test conditions of this table " 5. ablation rate ".
The dielectric properties of silicon nitride and boron nitride ceramic material are lower, and both thermal expansivity are complementary, and chemical reaction does not take place for both under hot conditions.Therefore it is suitable selecting boron nitride fibre excess weld metal silicon nitride pottery.And when reaction sintering, in this matrix material, grow many silicon nitride crystal whiskers.It is favourable to the heat-shock resistance of this matrix material that this silicon nitride matrix adds network structure that boron nitride fibre adds silicon nitride crystal whisker.
The impurity of this matrix material sees Table 2.
The impurity of table 2 boron nitride fibre excess weld metal silicon nitride ceramic composite
Impurity foreign matter content (weight %)
Fe
2O
3＜1.0
Al
2O
3＜0.4
CaO ＜0.05
K
2O ＜0.01
Na
2O ＜0.01
Si ＜0.2
O ＜1.0
Claims (3)
1, a kind of matrix material that belongs to inorganic fibre reinforcement pottery comprises that boron nitride fibre mixes with silica flour, process such as moulding and reaction sintering, it is characterized in that boron nitride fibre content is 5～20% (weight), and all the other are silicon nitride and impurity.
2,, it is characterized in that the preferential matrix material of selecting contains 8～17%(weight by the described matrix material of claim 1) boron nitride fibre.
3, by the matrix material of claim 1 or 2, it is characterized in that composite material surface is coated with redoubling through solidification treatment with special organic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104097A CN85104097B (en) | 1985-05-24 | 1985-05-24 | Boron nitride fiber reinforced reactively sintered silicon nitride ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104097A CN85104097B (en) | 1985-05-24 | 1985-05-24 | Boron nitride fiber reinforced reactively sintered silicon nitride ceramics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104097A true CN85104097A (en) | 1986-11-19 |
| CN85104097B CN85104097B (en) | 1988-10-05 |
Family
ID=4793628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104097A Expired CN85104097B (en) | 1985-05-24 | 1985-05-24 | Boron nitride fiber reinforced reactively sintered silicon nitride ceramics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85104097B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060457C (en) * | 1997-02-03 | 2001-01-10 | 汪宁 | Composite porcelain containing hexagonal boron nitride and preparation method thereof |
| CN102167610A (en) * | 2011-01-12 | 2011-08-31 | 中材高新材料股份有限公司 | Preparation method of boron nitride fiber fabric-reinforced silicon nitride ceramic material |
| CN101555156B (en) * | 2009-05-15 | 2011-11-30 | 山东大学 | Boron nitride crystal whisker/silicon nitride ceramic composite material and preparation method thereof |
| CN103724036A (en) * | 2013-07-23 | 2014-04-16 | 太仓派欧技术咨询服务有限公司 | Wave-transparent silicon nitride radome material and preparation method thereof |
| CN106116617A (en) * | 2016-06-20 | 2016-11-16 | 华南理工大学 | A kind of ultra-fine boron nitride porous fibre toughness reinforcing WC composite and preparation method thereof |
| CN108409336A (en) * | 2018-05-28 | 2018-08-17 | 江苏东浦精细陶瓷科技股份有限公司 | Silicon nitride ceramics and preparation method thereof |
-
1985
- 1985-05-24 CN CN85104097A patent/CN85104097B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060457C (en) * | 1997-02-03 | 2001-01-10 | 汪宁 | Composite porcelain containing hexagonal boron nitride and preparation method thereof |
| CN101555156B (en) * | 2009-05-15 | 2011-11-30 | 山东大学 | Boron nitride crystal whisker/silicon nitride ceramic composite material and preparation method thereof |
| CN102167610A (en) * | 2011-01-12 | 2011-08-31 | 中材高新材料股份有限公司 | Preparation method of boron nitride fiber fabric-reinforced silicon nitride ceramic material |
| CN102167610B (en) * | 2011-01-12 | 2012-11-21 | 中材高新材料股份有限公司 | Preparation method of boron nitride fiber fabric-reinforced silicon nitride ceramic material |
| CN103724036A (en) * | 2013-07-23 | 2014-04-16 | 太仓派欧技术咨询服务有限公司 | Wave-transparent silicon nitride radome material and preparation method thereof |
| CN106116617A (en) * | 2016-06-20 | 2016-11-16 | 华南理工大学 | A kind of ultra-fine boron nitride porous fibre toughness reinforcing WC composite and preparation method thereof |
| CN106116617B (en) * | 2016-06-20 | 2019-05-14 | 华南理工大学 | A kind of ultra-fine boron nitride porous fibre toughening WC composite material and preparation method |
| CN108409336A (en) * | 2018-05-28 | 2018-08-17 | 江苏东浦精细陶瓷科技股份有限公司 | Silicon nitride ceramics and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104097B (en) | 1988-10-05 |
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