Hexagonal boron nitride-yttrium silicon oxide composite material and preparation method thereof
A technology of hexagonal boron nitride and composite materials is applied in the field of ceramic matrix composite materials to achieve the effect of improving high temperature strength, good thermal shock resistance and excellent dielectric properties
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Embodiment 1
[0030] Example 1: Hexagonal boron nitride phase (h-BN) 95%-yttrium silicon oxide (Y 2 SiO 5 ) 5%
[0031] Put 36.27 grams of 0.5 micron hexagonal boron nitride powder, 2.95 grams of 200-mesh diyttrium trioxide powder and 0.78 grams of silicon dioxide powder into a silicon nitride tank for ball milling for 2 hours, dry, and sieve through an 80-mesh sieve. Then put it into a graphite mold for cold pressing, the applied pressure is 20MPa, and then put it into a hot-press furnace for hot-pressing sintering: the heating rate is 5°C / min, after heating to 1900°C, the sintering pressure is 40MPa, and the temperature is kept for 5 hours. The whole sintering process is carried out under the protection of argon, and the obtained reaction products are analyzed by X-ray diffraction as BN and Y 2 SiO 5 two phases. At this time, the volume content of BN is about 95%, and the Y 2 SiO 5 The volume content is about 5%. In this embodiment, the material density is 2.1 g cm-3 . The mechani...
Embodiment 2
[0032] Example 2: Hexagonal boron nitride phase (h-BN) 70%-yttrium silicon oxide (Y 2 SiO 5 ) 30%
[0033] 21.76 grams of 0.5 micron hexagonal boron nitride powder, 14.41 grams of 200-mesh diyttrium trioxide powder and 3.83 grams of silicon dioxide powder are packed into a silicon nitride tank for ball milling for 8 hours, dried, and sieved through a 80-mesh sieve. Then put it into a graphite mold for cold pressing, and apply a pressure of 15MPa, and then put it into a hot-press furnace for hot-pressing sintering: the heating rate is 8°C / min, after heating to 1800°C, the sintering pressure is 30MPa, and the temperature is kept for 3 hours. The whole sintering process is carried out under the protection of argon, and the obtained reaction products are analyzed by X-ray diffraction as BN and Y 2 SiO 5 two phases, such as figure 1 shown. At this time, the volume content of BN is about 70%, and the Y 2 SiO 5 The volume content is about 30%.
[0034] figure 2 for BN-Y 2 ...
Embodiment 3
[0035] Example 3: Hexagonal boron nitride phase (h-BN) 50%-yttrium silicon oxide (Y 2 SiO 5 ) 50%
[0036] 13.53 grams of 0.5 micron hexagonal boron nitride powder, 20.91 grams of 200-mesh diyttrium trioxide powder and 5.56 grams of silicon dioxide powder are packed into a silicon nitride tank for ball milling for 12 hours, dried, and sieved through a 80-mesh sieve. Then put it into a graphite mold for cold pressing, the applied pressure is 15MPa, and then put it into a hot-press furnace for hot-press sintering: the heating rate is 12°C / min, after heating to 1700°C, the sintering pressure is 20MPa, and the temperature is kept for 2 hours. The whole sintering process is carried out under the protection of argon, and the obtained reaction products are analyzed by X-ray diffraction as BN and Y 2 SiO 5 two phases. At this time, the volume content of BN is about 50%, and the Y 2 SiO 5 The volume content is about 50%. In this embodiment, the material density is 3.1 g cm -3 ....
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