A toughened alumina composite ceramic and its preparation method
A technology of composite ceramics and alumina, which is applied in the field of toughened alumina composite ceramics and its preparation, can solve the problems of insignificant toughening effect and achieve significant toughening effect and increase mechanical properties
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[0021] The invention provides a method for preparing toughened alumina composite ceramics, which may include:
[0022] (1) Weighing raw materials, said raw materials include ceramic raw materials and MgO additives; wherein, based on the total weight of said ceramic raw materials, by weight percentage, said ceramic raw materials include: 40-67% α-Al 2 o 3 (alpha crystal form Al 2 o 3 ), 1-17% SiO 2 , 15-25% ZrO 2 , 10-25% of β-SiC (β-SiC); preferably, ZrO 2 3Y-ZrO 2 (3mol%Y 2 o 3 Stable ZrO 2 ); Also preferably, the weight of the MgO additive is 0.1-0.3% of the total weight of the ceramic raw material;
[0023] (2) performing wet ball milling on the raw materials, and drying after ball milling to obtain a mixed powder;
[0024] (3) Put the mixed powder into a mold, and perform hot-press sintering in an inert atmosphere.
[0025] The inventor has discovered unexpectedly that when SiO 2 and α-Al 2 o 3 When the ratio is within the scope of the formula provided by the...
Embodiment 1
[0037] Example 1 Preparation of Toughened Alumina Composite Ceramics
[0038] (1) According to the formula: 63wt (weight).% α-Al 2 o 3 , 2.7wt.% SiO 2 , 18.3wt.% 3Y-ZrO 2 , 16wt.% β-SiC particles, 0.25wt.% MgO, weighed 18.90 g α-Al 2 o 3 , 0.81 g of SiO 2 , 5.49 g 3Y-ZrO 2 , 4.80 grams of β-SiC and 0.075 grams of MgO powder raw materials.
[0039] (2) Put the weighed raw materials into an agate ball mill jar, add 24mL of isopropanol as a ball milling medium, perform high-speed ball milling for 10 hours, set the speed of the ball mill to 400 rpm, and place the ball-milled raw materials in an oven for drying at 75°C After 24 hours, sieve with a 200-mesh sieve to obtain a uniformly mixed mixed powder.
[0040] (3) The mixed powder is placed in a graphite mold in N 2 Hot press sintering at 1530° C. for 1 hour in the atmosphere to obtain a ceramic sample with a holding pressure of 30 MPa. The specific parameters are as follows:
[0041] Heating and pressurization rate: T...
Embodiment 2
[0044] Example 2 Preparation of Toughened Alumina Composite Ceramics
[0045] (1) According to the formula: 55.3wt.% α-Al 2 o 3 , 8.7wt.% SiO 2 , 19.2wt.% 3Y-ZrO 2 , 16.8wt.% β-SiC particles, 0.25wt.% MgO, weighed 16.59 g α-Al 2 o 3 , 2.61 g of SiO 2 , 5.76 g 3Y-ZrO 2 , 5.04 grams of β-SiC and 0.075 grams of MgO powder raw materials.
[0046] (2) Put the weighed raw materials into an agate ball mill jar, add 24mL of isopropanol as a ball milling medium, perform high-speed ball milling for 10 hours, set the speed of the ball mill to 400 rpm, and place the ball-milled raw materials in an oven for drying at 75°C After 24 hours, sieve with a 200-mesh sieve to obtain a uniformly mixed mixed powder.
[0047] (3) The mixed powder is placed in a graphite mold in N 2 Hot press sintering at 1530° C. for 1 hour in the atmosphere to obtain a ceramic sample with a holding pressure of 30 MPa, and the specific parameters are the same as those in Example 1.
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