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Zirconium oxide base complex phase ceramic and preparation process thereof

A multi-phase ceramic and zirconia-based technology, which is applied in the field of zirconia-based multi-phase ceramics and its preparation, can solve the problem of high preparation cost, and achieve the effects of lowering specific gravity, lowering raw material cost, and reducing firing shrinkage

Inactive Publication Date: 2007-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production cost is high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] According to the formula Y-TZP65vol%, Al 2 o 3 35vol%, plus MgO 1.0wt%, SiO 2 0.72 wt%. Weigh 28 kg of submicron zirconia powder (0.5 μm, containing 3mol% Y 2 o 3 ), micron zirconia powder (1.2μm) 7 kg, industrial α-Al 2 o 3 Powder (2 Content 24wt%) 1.42 kg, add 30 kg of water, 660 g of ammonium polyacrylate, mix by ball milling for 20 hours, spray granulation, 150 MPa isostatic pressing, 1450 ° C, 2 hours firing, obtained 35vol% Al 2 o 3 / Y-TZP composite ceramic material. The firing line shrinkage is 17%, the bending strength of the material is 640-700MPa, and the fracture toughness is 11-13MPam 0.5 . With Y-TZP and 15vol% Al 2 o 3 Compared with Y-TZP composite ceramics, the wear rate under the same friction and wear conditions is reduced by 48% and 35%, and the cost of components is reduced by 37% and 30%.

Embodiment 2

[0010] According to the formula Y-TZP 55vol%, Al 2 o 3 45vol%, plus MgO 0.82wt%, SiO 2 1.24 wt%. Weigh 35 kg of zirconia superfine powder (0.5 μm, containing 3mol% Y 2 o 3 ), Industrial α-Al 2 o 3 Powder (2 Content 24wt%) 2.78 kg, add 37.5 kg of water, 690 g of ammonium polyacrylate, mix by ball milling for 15 hours, spray granulation, 195MPa isostatic pressing, 1460 ° C, 2 hours firing, obtained 45vol% AI 2 o 3 / Y-TZP composite ceramic material. The shrinkage of the firing line is 16.4%, the bending strength of the material is 627MPa, and the fracture toughness is 9.9MPam 0.5 . With Y-TZP and 15vol% Al 2 o 3 Compared with Y-TZP composite ceramics, the wear rate under the same friction and wear conditions is also reduced (32% and 16%), and the material cost of parts is reduced by 42% and 33%.

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Abstract

The invention discloses a zirconia based complex phase ceramic and the manufacture method that belongs to zirconia based structure ceramic field. It contains 2-3mol% Y2O3, 50-65%mol% Y-TZP and 35-50mol% alpha-Al2O3, and sintering assistant agent MgO 0.6-1.0wt% and SiO2 0.6-2.5wt%. The process includes the following steps: mixing zirconia powder that contains Y2O3 with alpha-Al2O3, MgO powder, and SiO2, adding 55-70wt% water, and 1-2wt% ammonium polyacrylate dispersant, taking ball milling, spraying and graining, molding from powder under 150-200MPa, sintering in 1450-1480 degree centigrade to gain the material. The advantages of the invention are that it has simple process, low cost, and has high percent of qualification.

Description

technical field [0001] The invention relates to a zirconia-based composite phase ceramic and a preparation method thereof, belonging to the field of zirconia-based structural ceramics. technical background [0002] In order to improve the low-temperature performance degradation problem of Y-TZP ceramics and further improve its mechanical properties, people added Al to Y-TZP. 2 o 3 Research. However, in previous studies, Al 2 o 3 Most of the added amount is less than 15vol%. The Y-TZP ultrafine powder as the main raw material is expensive, and the process performance of making large-sized parts is poor, and the yield is low. Also added more Al 2 o 3 research, but hot isostatic pressing sintering is required, and the equipment is expensive. There are also 10-40vol% submicron Al added to the nano Y-TZP powder 2 o 3 , sintered at 1550°C and atmospheric pressure for 2h, the obtained 10-30vol% Al 2 o 3 Al 2 o 3 / Y-TZP composite ceramic material, the composite ceramic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/10
Inventor 杨正方袁启明李金有
Owner TIANJIN UNIV
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