Alumina in-situ composite zirconia ceramic powder, ceramic preparation method and application
A zirconia ceramics and in-situ compounding technology, which is applied in the field of alumina in-situ compounded zirconia ceramic powders and ceramics preparation, can solve the problems of lack of low-temperature assisted sintering, poor fracture toughness, and poor drop resistance. Achieve the effect of improving comprehensive mechanical properties, increasing density, and being easy to oxidize
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[0027] The present invention provides an in-situ generated alumina composite zirconia ceramic, which is prepared from the above-mentioned in-situ generated alumina composite zirconia ceramic powder, and also provides the in-situ generated alumina composite zirconia ceramics. The preparation method of composite zirconia ceramics comprises the following steps:
[0028] a) Uniformly mix the zirconia powder whose mass percentage is 79%2 O 3 -ZrO 2 .
[0029] In this preparation method, the aluminum-silicon alloy composition is prepared by the existing alloy grinding method, the jet pulverization method or the inert gas centrifugal spray method, etc., but the metal silicon has the dual effects of generating silicon oxide and adjusting the softening point of the aluminum-silicon alloy. Compared with alumina and zirconia, the melting point of silica is lower, and appropriate silica is easier to fill defects such as pores at the grain boundary, but excessive silica will cause the pe...
Embodiment 1
[0045] Weigh 1350g of pure aluminum with a purity of more than 99.5% and 150g of silicon powder with a purity of 99.9%, put it into a crucible, then heat it to 1200 ℃ under the protection of Ar atmosphere to melt, and under the protection of Ar atmosphere, centrifugal spray granulation to obtain a silicon content of 10% The aluminum-silicon combination powder is added to the ball milling tank, water and ethanol are added at a ratio of 1:1 to 800g, then zirconium balls are added for ball milling for 12 to 14 hours, and then dried at 110 ℃ to 130 ℃ in a nitrogen atmosphere, and the laser particle size is passed The tester test D50 is 4.71 μm, and the oxygen content of the powder surface is 0.35% tested by an oxygen analyzer.
[0046] Weigh commercially available 3Y with a median particle size D50 of 0.35 μm 2 O 3 -ZrO 2 Powder 3975g, weigh 1025g of the above-mentioned aluminum-silicon composite powder with a D50 particle size of 4.71 μm, add all the weighed powders into a ball...
Embodiment 2
[0051] Weigh 1305g of pure aluminum with a purity of more than 99.5% and 195g of silicon powder with a purity of 99.9%, put it into a crucible, then heat it to 1200 ° C under the protection of Ar atmosphere to melt, and under the protection of Ar atmosphere, centrifugal spray granulation to obtain a silicon content of 13% Add 750g of water and ethanol in the ratio of 1:1, then add zirconium balls, ball mill for 72h~74h, then dry at 110℃~130℃ under nitrogen atmosphere, and pass the laser The particle size tester test D50 is 0.55μm, and the oxygen content of the powder surface is 2.1% tested by an oxygen analyzer.
[0052] Weigh 1495.5 g of commercially available magnesia-stabilized zirconia powder with a median particle size D50 of 0.13 μm, weigh 4.5 g of the above-mentioned aluminum-silicon composite powder with a D50 particle size of 0.55 μm, and weigh all the powders. Put it into the ball mill tank, add 750g of water and ethanol at a ratio of 1:1, add 150g of PVA aqueous sol...
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