CN102432298A - Yttrium silicon oxygen nitrogen-boron nitride (Y4Si2O7N2-BN) ceramic matrix composite material and preparation method thereof - Google Patents
Yttrium silicon oxygen nitrogen-boron nitride (Y4Si2O7N2-BN) ceramic matrix composite material and preparation method thereof Download PDFInfo
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- CN102432298A CN102432298A CN2010102961274A CN201010296127A CN102432298A CN 102432298 A CN102432298 A CN 102432298A CN 2010102961274 A CN2010102961274 A CN 2010102961274A CN 201010296127 A CN201010296127 A CN 201010296127A CN 102432298 A CN102432298 A CN 102432298A
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Abstract
The invention relates to the field of ceramic matrix composite materials, in particular to an yttrium silicon oxygen nitrogen-boron nitride (Y4Si2O7N2-BN) ceramic matrix composite material and a preparation method thereof. The composite material consists of 5-95 percent by volume of yttrium silicon oxygen nitrogen and the balance of boron nitride. Y4Si2O7N2 powder and BN powder are used as raw materials, the powder materials are ball-milled for 1-24 hours, are arranged in a graphite die after being dried and sieved, and are cold pressed at 10-15Mpa, then the temperature is raised to 1800-2100 DEG C at the heating rate of 5-40 DEG C/min in a hot press furnace introduced with nitrogen as a protective atmosphere, the temperature is preserved for 1-3 hours, and the hot press pressure is 20-40MPa. According to the invention, the Y4Si2O7N2-BN ceramic matrix composite material with high purity, good density, high strength and low thermal conductivity can be prepared through hot pressed sintering in a short time.
Description
Technical field
The present invention relates to the ceramic matric composite field, be specially a kind of yttrium silica nitrogen-boron nitride (Y
4Si
2O
7N
2-BN) ceramic matric composite and preparation method thereof.
Background technology
Y
4Si
2O
7N
2It is a kind of novel quaternary lower thermal conductivity stupalith.It has plurality of advantages aspect thermal property, it has lower thermal conductivity (room temperature thermal conductivity 1.8-2.0Wm
-1K
-1, 1000 ℃ of elevated temperature heat conductance 1.4-1.6Wm
-1K
-1), lower thermal expansivity (4-6 * 10
-6K
-1), good high temperature resistant, antioxidant property, lower density (4.83g/cm
3) and modulus (Young's modulus 185GPa), (flexural strength 157 ± 7MPa), (Vickers' hardness 10.3 ± 0.3GPa) etc. all have potential application foreground widely at high-technology fields such as Aeronautics and Astronautics, Iron And Steel Industry to higher hardness to medium tenacity.Although Y
4Si
2O
7N
2Have excellent thermal property, but its relatively poor workability, heat-shock resistance, and big limitations such as intrinsic fragility its application.In order to improve above-mentioned unfavorable performance, the present invention has developed Y
4Si
2O
7N
2-BN matrix material is about Y
4Si
2O
7N
2The research of-BN matrix material and preparation aspect thereof still belongs to blank both at home and abroad.
Summary of the invention:
Yttrium silica nitrogen-boron nitride ceramic matric composite that the object of the invention is to provide a kind of processes, mechanical property is good and preparation method thereof.
Technical scheme of the present invention is:
A kind of yttrium silica nitrogen-boron nitride ceramic matric composite, by yttrium silica nitrogen and SP 1 two phase composites, per-cent meter by volume, the content of SP 1 is 5～95% (being preferably 10～30%) in the matrix material, surplus is a yttrium silica nitrogen.
Described yttrium silica nitrogen-boron nitride ceramic matric composite, yttrium silica nitrogen is evenly distributed with SP 1 two mutually, and is as shown in Figure 3.
The preparation method of said yttrium silica nitrogen-boron nitride ceramic matric composite comprises the steps:
1) raw material powder is formed and composition range:
With Y
4Si
2O
7N
2Powder and h-BN powder are raw material, Y
4Si
2O
7N
2With the mol ratio of h-BN powder be (0.55～2.47): 1;
2) preparation technology:
Raw material is through ball milling 1～24 hour (being preferably 8～16 hours); Pack in the graphite jig; Cold pressing with the pressure of 10～15MPa and to become pie in 1～5 minute; Rise to 1800 ℃～2100 ℃ hot pressing 1～3 hour with the temperature rise rate of 5～40 ℃/min in as the hot pressing furnace of protective atmosphere being connected with nitrogen, hot pressing pressure is 20～40MPa.It is free from foreign meter by Y to utilize above-mentioned technology finally to obtain
4Si
2O
7N
2Matrix material with h-BN two phase composites.
Among the present invention, Y
4Si
2O
7N
2The granularity of powder is 100～300 orders, and the granularity of h-BN powder is 100～300 orders.
Among the present invention, ball milling can carry out conventional wet-milling for silicon nitride ball adds ethanol.
Advantage of the present invention is:
1. the material composition of the present invention's use is simple, is respectively Y
4Si
2O
7N
2Powder and h-BN powder.
2. technology is simple, and cost is low.The present invention obtains the fine and close Y of inclusion-free through a simple step hot-press method at (below 2100 ℃) and short period of time (generally in three hours)
4Si
2O
7N
2-BN ceramic matric composite.
3. excellent mechanical property.Y of the present invention
4Si
2O
7N
2-BN ceramic matric composite density is higher, and mechanical properties such as flexural strength, fracture toughness property obviously are superior to Y
4Si
2O
7N
2Monophase materials, and have good workability, heat-shock resistance etc.
Description of drawings
Fig. 1 is prepared Y
4Si
2O
7N
2The XRD figure spectrum of-30vol.%BN matrix material.
Fig. 2 is prepared Y
4Si
2O
7N
2The fracture apperance of-20vol.%BN matrix material.
Fig. 3 is prepared Y
4Si
2O
7N
2Two of-40vol.%BN matrix material the pattern that distributes mutually.
Embodiment
Through instance the present invention is detailed below.
Embodiment 1
With Y
4Si
2O
7N
2(300 orders, purity: 99wt.%) 57.68g, (100 orders, purity: 99wt.%) 11.62g pours in the silicon nitride ball milling jar BN powder powder, uses silicon nitride ball to add ethanol wet-milling 12 hours, afterwards 50 ℃ of oven dry 48 hours.It is that the inwall of 50mm scribbles in the graphite jig of BN and colds pressing that powder after the oven dry is poured diameter into.After colding pressing 3 minutes with the pressure of 12MPa, mould is packed in the hot pressing furnace, under the flowing nitrogen protection, be warming up to 2100 ℃ with the temperature rise rate of 5 ℃/min, hot pressing 180min, hot pressing pressure are 30MPa.The block materials that obtains is Y through X-ray diffraction analysis
4Si
2O
7N
2With BN two mutually, the two volume ratio is 70: 30, does not have other impurity basically, and is as shown in Figure 1.The density of measuring is 3.94g/cm
3, density is 97.06%.Three-point bending strength is 279 ± 14MPa, Vickers' hardness 4.7 ± 0.1GPa, and universal cutter can be processed.
Embodiment 2
With Y
4Si
2O
7N
2(300 orders, purity: 99wt.%) 77.62g, (100 orders, purity: 99wt.%) 9.12g pours in the silicon nitride ball milling jar h-BN powder powder, uses silicon nitride ball to add ethanol wet-milling 24 hours, dries 48 hours for 50 ℃ afterwards.It is that the inwall of 50mm scribbles in the graphite jig of BN and colds pressing that powder after the oven dry is poured diameter into.After colding pressing 3 minutes with the pressure of 15MPa, mould is packed in the hot pressing furnace of graphite heater, under the flowing nitrogen protection, be warming up to 1800 ℃ with the temperature rise rate of 15 ℃/min, hot pressing 60min, hot pressing pressure are 40MPa.The matrix material that obtains is Y through X-ray diffraction analysis
4Si
2O
7N
2With BN two mutually, the two volume ratio is 80: 20, does not have other impurity basically.The density of material of measuring is 4.09g/cm
3, density is 94.74%.Three-point bending strength is 286 ± 12MPa, fracture toughness property 2.04 ± 0.03MPam
1/2, fracture apperance is as shown in Figure 2.
Embodiment 3
With Y
4Si
2O
7N
2(300 orders, purity: 99wt.%) 58.40g, (100 orders, purity: 99wt.%) 18.30g pours in the silicon nitride ball milling jar h-BN powder powder, uses silicon nitride ball to add ethanol wet-milling 6 hours, dries 48 hours for 50 ℃ afterwards.It is that the inwall of 50mm scribbles in the graphite jig of BN and colds pressing that powder after the oven dry is poured diameter into.After colding pressing 4 minutes with the pressure of 10MPa, mould is packed in the hot pressing furnace of graphite heater, under the flowing nitrogen protection, be warming up to 1900 ℃ with the temperature rise rate of 30 ℃/min, hot pressing 120min, hot pressing pressure are 20MPa.The matrix material that obtains is Y through X-ray diffraction analysis
4Si
2O
7N
2With BN two mutually, the two volume ratio is 60: 40.The density of material of measuring is 3.53g/cm
3, density is 92.86%.Three-point bending strength is 220 ± 12MPa, fracture toughness property 1.83 ± 0.08MPam
1/2Two patterns that distribute mutually are as shown in Figure 3.
Claims (4)
1. yttrium silica nitrogen-boron nitride ceramic matric composite is characterized in that: this matrix material is by yttrium silica nitrogen and SP 1 two phase composites, per-cent meter by volume, and the content of SP 1 is 5～95% in the matrix material, surplus is a yttrium silica nitrogen.
2. according to the described yttrium silica of claim 1 nitrogen-boron nitride ceramic matric composite, it is characterized in that: the preferred content of SP 1 is 10～30%.
3. according to the preparation method of the described yttrium silica of claim 1 nitrogen-boron nitride ceramic matric composite, it is characterized in that, comprise the steps:
1) raw material powder is formed:
With Y
4Si
2O
7N
2Powder and h-BN powder are raw material, Y
4Si
2O
7N
2With the mol ratio of h-BN powder be (0.55～2.47): 1;
2) preparation technology:
Raw material process ball milling 1～24 hour; Pack in the graphite jig; Cold pressing with the pressure of 10～15MPa and to become pie in 1～5 minute; Rise to 1800 ℃～2100 ℃ hot pressing 1～3 hour with the temperature rise rate of 5～40 ℃/min in as the hot pressing furnace of protective atmosphere being connected with nitrogen, hot pressing pressure is 20～40MPa.
4. according to the preparation method of the described yttrium silica of claim 3 nitrogen-boron nitride ceramic matric composite, it is characterized in that Y
4Si
2O
7N
2The granularity of powder is 100～300 orders, and the granularity of h-BN powder is 100～300 orders.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010296127 CN102432298B (en) | 2010-09-29 | 2010-09-29 | Yttrium silicon oxygen nitrogen-boron nitride (Y4Si2O7N2-BN) ceramic matrix composite material and preparation method thereof |
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|---|---|---|---|
| CN 201010296127 CN102432298B (en) | 2010-09-29 | 2010-09-29 | Yttrium silicon oxygen nitrogen-boron nitride (Y4Si2O7N2-BN) ceramic matrix composite material and preparation method thereof |
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| CN102432298B CN102432298B (en) | 2013-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108002841A (en) * | 2017-03-30 | 2018-05-08 | 中国科学院金属研究所 | Hexagonal boron nitride-ytterbium silica nitrogen ceramic matric composite and its in-situ preparation method |
-
2010
- 2010-09-29 CN CN 201010296127 patent/CN102432298B/en active Active
Non-Patent Citations (5)
| Title |
|---|
| 《Ceramics International》 20060228 Daqing Wei et al. Microstructure of hot-pressed h-BN/Si3N4 ceramic composites with Y2O3-Al2O3 sintering additive 第221-226页 1-4 第33卷, * |
| DAQING WEI ET AL.: "Microstructure of hot-pressed h-BN/Si3N4 ceramic composites with Y2O3–Al2O3 sintering additive", 《CERAMICS INTERNATIONAL》 * |
| K. J. D. MACKENZIE ET AL.: "Rietveld Refinement of the Crystal Structures of the Yttrium Silicon Oxynitrides Y2Si3N4O3 (N-Melilite) and Y4Si2O7N2 (J-Phase)", 《JOURNAL OF THE EUROPEAN CERAMIC SOCIETY》 * |
| 崔秀君等: "Sialon结合BN复合材料致密化影响因素的研究", 《钢铁研究》 * |
| 裴雨辰等: "SiO2-BN-Si3N4系复相陶瓷制备及性能", 《稀有金属材料与工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108002841A (en) * | 2017-03-30 | 2018-05-08 | 中国科学院金属研究所 | Hexagonal boron nitride-ytterbium silica nitrogen ceramic matric composite and its in-situ preparation method |
| CN108002841B (en) * | 2017-03-30 | 2021-01-08 | 中国科学院金属研究所 | Hexagonal boron nitride-ytterbium silicon oxynitride ceramic matrix composite material and in-situ preparation method thereof |
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| CN102432298B (en) | 2013-10-09 |
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