Semitransparent silicon nitride ceramics and its preparation method
A silicon nitride ceramic, translucent technology, applied in the field of translucent silicon nitride ceramics and its preparation, can solve the problems of difficult sintering, high energy consumption, high manufacturing cost, etc.
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Embodiment 1
[0018] α-Si 3 N 4 powder, MgO powder, Y 2 o 3 Powder and Al 2 o 3 Powder mixture is the raw material, where α-Si 3 N 4 The mass content of powder is 83%, the mass content of MgO powder is 6%, Y2 o 3 The mass content of powder is 3%, Al 2 o 3 The mass content of powder is 8%. Ball mill the mixture for 10 hours on a planetary ball mill, alcohol is the ball milling medium, Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Si 3 N 4 powder, MgO powder, Y 2 o 3 Powder and Al 2 o 3 powder): alcohol mass ratio=2:1:3. The mixed material after ball milling is dried under vacuum at 83-87°C, sieved through a 100-mesh sieve, and then put into a circular graphite mold with an inner diameter of 20mm. Put the graphite mold into the pulse current sintering furnace, apply an axial pressure of 25MPa, and the 2 Sintering under atmosphere, N 2 The gas pressure is 0.05MPa, and the heating rate is 150°C / min. When the temperature rises to the sintering temperature ...
Embodiment 2
[0020] α-Si 3 N 4 powder, MgO powder and Al 2 o 3 Powder mixture is the raw material, where α-Si 3 N 4 The mass content of powder is 90%, the mass content of MgO powder is 5%, Al 2 o 3 The mass content of powder is 5%. Ball mill the mixture for 10 hours on a planetary ball mill, alcohol is the ball milling medium, Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Si 3 N 4 powder, MgO powder and Al 2 o 3 powder): alcohol mass ratio=2:1:3. The mixed material after ball milling is dried under vacuum at 83-87°C, sieved through a 100-mesh sieve, and then put into a circular graphite mold with an inner diameter of 20mm. Put the graphite mold into the pulse current sintering furnace, apply an axial pressure of 30MPa, and the 2 Sintering under atmosphere, N 2 The gas pressure is 0.05MPa, and the heating rate is 150°C / min. When the temperature rises to the sintering temperature of 1850°C, it is kept for 15 minutes and then cooled to room temperature with ...
Embodiment 3
[0022] α-Si 3 N 4 powder, MgO powder, Y 2 o 3 Powder and Al 2 o 3 Powder mixture is the raw material, where α-Si 3 N 4 The mass content of powder is 86%, the mass content of MgO powder is 4%, Y 2 o 3 The mass content of powder is 2%, Al 2 o 3 The mass content of powder is 8%. Ball mill the mixture for 10 hours on a planetary ball mill, alcohol is the ball milling medium, Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Si 3 N 4 powder, MgO powder, Y 2 o 3 Powder and Al 2 o 3 powder): alcohol mass ratio=2:1:3. The mixed material after ball milling is dried under vacuum at 83-87°C, sieved through a 100-mesh sieve, and then put into a circular graphite mold with an inner diameter of 20mm. Put the graphite mold into the pulse current sintering furnace, apply an axial pressure of 25MPa, and the 2 Sintering under atmosphere, N 2 The gas pressure is 0.05MPa, and the heating rate is 300°C / min. When the temperature rises to the sintering temperatur...
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