Aluminum oxide in-situ composite zirconium oxide ceramic powder, ceramic preparation method and application
A zirconia ceramic and in-situ composite technology, which is applied in the field of alumina in-situ composite zirconia ceramic powder and ceramic 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 ceramic powder. The preparation method of composite zirconia ceramics comprises the following steps:
[0028] a) uniformly mix the zirconia powder with a mass percentage of 79%2 o 3 -ZrO 2 .
[0029] In this preparation method, the aluminum-silicon alloy composition is prepared by existing technologies such as the existing alloy grinding method, jet milling method or inert gas centrifugal spraying method, but there are dual functions of generating silicon oxide and adjusting the softening point of the aluminum-silicon alloy for metal silicon. Effect, and because the melting point of silica is lower than that of alumina and zirconia, appropriate silica is easier to fill defects such as holes at grain boundaries, bu...
Embodiment 1
[0045] Weigh 1350g of pure aluminum with a purity greater than 99.5% and 150g 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 centrifugal spray granulation under the protection of Ar atmosphere to obtain a silicon content of 10% Add the aluminum-silicon combination powder into the ball mill tank, add 800g of water and ethanol at a ratio of 1:1, then add zirconium balls and ball mill for 12-14 hours, then dry at 110°C-130°C under nitrogen atmosphere, and pass laser particle size The D50 of the tester is 4.71 μm, and the oxygen content of the powder surface is 0.35% by the oxygen analyzer.
[0046] Weigh commercially available 3Y with a median particle size D50 of 0.35 μm 2 o 3 -ZrO 2 Powder 3975g, take the above-mentioned D50 particle diameter and be 1025g of the aluminum-silicon combination powder of 4.71 μ m, add all the powders that have weighed into the ball mill tank, add 2500g de...
Embodiment 2
[0051] Weigh 1305g of pure aluminum with a purity greater 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 centrifugal spray granulation under the protection of Ar atmosphere to obtain a silicon content of 13% Add the aluminum-silicon composite powder into the ball mill tank, add 750g of water and ethanol at a ratio of 1:1, then add zirconium balls, ball mill for 72h~74h, then dry at 110℃~130℃ under a nitrogen atmosphere, and pass through a laser The D50 of the particle size tester is 0.55 μm, and the oxygen content of the powder surface is 2.1% by the 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 o...
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