High-purity super-tough zirconia composite ceramic gear and preparation method thereof

A composite ceramic and zirconia technology, applied in the field of high-purity super-tough zirconia composite ceramic gears and their preparation, can solve problems such as inability to meet requirements, and achieve the effects of small grain size, small wear amount, and high density

Inactive Publication Date: 2017-07-25
南京金鲤新材料有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0012] In order to solve the situation that the existing high-purity super-tough zirconia composite ceramic gears used in high-end precision equipment canno...
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Abstract

The invention provides a novel high-purity super-tough zirconia composite ceramic gear and a preparation method thereof. The invention provides the high-purity super-tough zirconia composite ceramic gear prepared from high purity zirconia and other oxides through compounding and the preparation method thereof. The nanometer high purity composite zirconia powder, a residual-free binder, a residual-free surfactant, a residual-free lubrication agent and a residual-free plasticizer are mixed, then the mixture is subjected to granulation, the granules are added into an injection molding machine and are subjected to injection molding, and the molded granules are subjected to gum dumping and sintering treatment so that the high-purity super-tough zirconia composite ceramic gear is obtained. The high-purity super-tough zirconia composite ceramic gear has the advantages of high purity, high toughness, high strength, simple preparation process and equipment, low cost, high yield, low energy consumption and high production efficiency and is suitable for industrial production.

Technology Topic

PlasticizerOxide +6

Examples

  • Experimental program(1)

Example Embodiment

[0187] The invention relates to a high-purity super-tough zirconia composite ceramic gear and a preparation method thereof. The specific implementation steps are as follows.
[0188] (1) Choose the molar content of yttrium oxide as 3%, the weight percentage of hafnium oxide as 1%, the weight percentage of aluminum oxide as 5%, the weight percentage of silicon oxide as 3%, the weight percentage of cerium oxide as 1%, and the weight percentage as europium oxide as 0.5% zirconia composite powder, the main element purity of the zirconia composite powder is 99.999%, the primary particle size of the zirconia composite powder is 4.2 nanometers, the composite powder and 99.99% polyvinyl alcohol weight percentage 2%, 99.99% 3% by weight of octadecanoic acid, 3% by weight of 99.99% polyethylene wax, and 5% by weight of 99.99% paraffin wax were mixed at 165 degrees for 14 hours.
[0189] (2) Put the mixed material obtained in step (1) into an extrusion granulator to granulate particles with a maximum size of 8 mm at 165 degrees, and then put the granulated particles into an injection molding machine for injection molding. The inlet temperature is 170 degrees and the outlet temperature is 120 degrees. An injection molding blank is obtained, the gear blank is taken out, and the gate is polished.
[0190] (3) Put the gear blank obtained in step (2) into the debinding sintering furnace, the heating rate is 40 degrees/hour, the debinding temperature is 600 degrees, and the debinding time is 24 hours. With the furnace cooling, the debinding Put the glued blank into the sintering furnace. The first stage heating rate is 40 degrees/hour, the target temperature is 750 degrees, and the holding time is 1 hour. The second stage heating rate is 60 degrees/hour, and the target temperature is 1000 degrees. The time is 1 hour, the third stage heating rate is 60 degrees/hour, the target temperature is 1350 degrees, the holding time is 4 hours, the first stage cooling rate is 40 degrees/hour, the target temperature is 1000 degrees, the second stage cooling rate It is 30 degrees/hour and the target temperature is 30 degrees, that is, a high-purity super-tough zirconia composite ceramic gear is obtained.
[0191] (4) In the measurement step (3), the relative density of the high-purity super-tough zirconia composite ceramic gear is 97.17%, the purity is 99.9903%, the grain size is 1.1 microns, the bending strength is 1532MPa, and the hardness is HV16018.

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