Silicon nitride-based composite ceramic material and microwave sintering preparation method thereof
A composite ceramic and silicon nitride-based technology, which is applied in the field of silicon nitride-based composite ceramic materials and their microwave sintering preparation, to achieve the effects of reducing internal temperature gradients, reducing production costs, and improving fracture toughness
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Embodiment 1
[0024] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 75%, Y 2 o 3 3%, MgO 5%, Al 2 o 3 2%, (W, Ti) C 15% are carried out batching, and the mixed powder of preparation is medium with absolute ethanol, and silicon nitride ball is mill ball, puts into corundum ball mill tank and ball mills for 48 hours, and ball-to-material ratio is 7: 1. Add polyvinyl alcohol aqueous solution with a concentration of 3wt% 2 hours before the end of ball milling; dry and grind after ball milling, and pass through a 100-mesh sieve, and dry-press the sieved powder at a pressure of 150 MPa. 3 minutes; put the compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, evacuate the furnace cavity into a vacuum state, and then pour in 0.11MPa nitrogen gas; turn on the microwave power supply for heating, at a rate of 20°C / min Heating rate Heat the sample to...
Embodiment 2
[0026] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 68%, Y 2 o 3 5%, MgO 3%, Al 2 o 3 4%, (W, Ti) C 20% are carried out batching, the mixed powder of preparation is medium with absolute ethanol, and silicon nitride ball is mill ball, puts into corundum ball mill tank and ball mills for 48 hours, and ball-to-material ratio is 7: 1. Add polyvinyl alcohol aqueous solution with a concentration of 5wt% 2 hours before the end of ball milling; dry and grind after ball milling, pass through a 100-mesh sieve, and dry-press the sieved powder at a pressure of 200 MPa, hold the pressure 3 minutes; put the green compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, evacuate the furnace cavity into a vacuum state, and then inject 0.11MPa nitrogen gas; turn on the microwave power supply for heating, at a rate of 25°C / min Heating rate Hea...
Embodiment 3
[0028] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 72%, Y 2 o 3 5%, MgO 5%, Al 2 o 32%, (W,Ti)C 15%, Ni1% for batching, the prepared mixed powder was mixed with absolute ethanol as the medium, silicon nitride balls were used as grinding balls, and put into a corundum ball mill jar for ball milling for 48 hours, the ball-to-material ratio 7:1, and add a polyvinyl alcohol aqueous solution with a concentration of 5wt% 2 hours before the end of ball milling; dry and grind after ball milling, and pass through a 100-mesh sieve, and dry press the sieved powder at a pressure of 150MPa , hold the pressure for 3 minutes; put the compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, pump the furnace cavity into a vacuum state, and then pour in 0.12MPa nitrogen gas; turn on the microwave power supply for heating, at 30°C Heat the sam...
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