Preparation method of B4C-Al2O3 composite ceramic
A b4c-al2o3, multiphase ceramic technology, applied in the field of powder metallurgy, can solve the problems of low fracture toughness and flexural strength, difficult densification preparation, high sintering temperature, meet the requirements of mechanical properties, inhibit the growth of grains, good mechanical properties
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Embodiment 1
[0032] Accurately weigh B 4 C. α-Al 2 o 3 and graphite raw material powder, B 4 C and α-Al 2 o 3 Each accounts for 50vol.%. In addition, the amount of graphite added is: Y 2 o 3 The molar ratio of graphite to graphite is 1:2.5; put the weighed powder into a polyurethane ball mill tank, the ball milling beads are agate balls, and then add tert-butanol solution as a mixing medium. Mill on the ball mill for 3 hours, the rotation speed of the ball mill is 300r / min, and the turning speed is 30r / min, so that the raw materials are fully and evenly mixed; take out the evenly mixed material from the ball mill tank, put it into a stainless steel plate, and place it on the Freeze and agglomerate it in the refrigerator, and then carry out sufficient freeze-drying treatment on the FD-A-50 freeze dryer; the specific conditions of the freeze-drying treatment are: the temperature is -50°C, the vacuum degree is 24Pa, and the freeze-drying time is 36h, the main purpose is to remove the t...
Embodiment 2
[0034] Accurately weigh B 4 C. α-Al 2 o 3 , Y 2 o 3 and graphite raw powder, where, B 4 C. α-Al 2 o 3 and Y 2 o 3 , the volume of these three is calculated as 100%, B 4 C accounts for 50vol.%, α-Al 2 o 3 49vol.%, Y 2 o 3 It accounts for 1vol.%, and the addition amount of graphite is calculated separately, and the addition amount is: Y 2 o 3 The molar ratio to graphite is 1:2.5; put the weighed powder into the polyurethane ball mill tank in turn, the ball milling beads are agate balls, and then add an appropriate amount of tert-butanol solution as the mixing medium, in the WL-1 type Mill on the planetary particle ball mill for 2 hours, the rotation speed of the ball mill is 350r / min, and the rotation speed is 30r / min, so that the raw materials are fully and evenly mixed; take out the evenly mixed material from the ball mill tank, put it into a stainless steel plate, Place it in the refrigerator to freeze and agglomerate, and then carry out sufficient freeze-dryin...
Embodiment 3
[0036] Accurately weigh B 4 C. α-Al 2 o 3 , Y 2 o 3 and graphite raw powder, where, B 4 C. α-Al 2 o 3 and Y 2 o 3 , the volume of these three is calculated as 100%, B 4 C accounts for 50vol.%, α-Al 2 o 3 45vol.%, Y 2 o 3 It accounts for 5vol.%. In addition, the addition amount of graphite is calculated separately, and the addition amount is: Y 2 o 3 The molar ratio to graphite is 1:2.5; put the weighed powder into the polyurethane ball mill tank in turn, the ball milling beads are agate balls, and then add an appropriate amount of tert-butanol solution as the mixing medium, in the WL-1 type Mill on the planetary particle ball mill for 2 hours, the rotation speed of the ball mill is 350r / min, and the rotation speed is 30r / min, so that the raw materials are fully and evenly mixed; take out the evenly mixed material from the ball mill tank, put it into a stainless steel plate, Place it in the refrigerator to freeze and agglomerate, and then carry out sufficient fre...
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