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Method for preparing rear-earth modified zirconium diboride/aluminum oxide composite powder

A technology of aluminum oxide and composite powder is applied in the field of preparing rare earth modified zirconium diboride/aluminum oxide composite powder to achieve the effects of improving density, low manufacturing cost and convenient operation

Inactive Publication Date: 2012-07-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the modification of multiphase ceramic powders by coating rare earth oxides to improve the performance of the powders.
Especially the use of rare earth oxides on ZrB 2 / Al 2 o 3 The research on encapsulation modification on the surface of composite powder has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take ZrO with a particle size of 60-70 μm 2 10g, 140~150μm B 2 o 3 10g and 40g of 100-150μm Al powder were placed in a ball mill for mechanical dry mixing for 8 hours, and the ball-to-material ratio was 2:1. The mixture was pressed under a pressure of 5 MPa to form a green body with a density equivalent to 40% of the theoretical density. Then the green body is placed in a self-propagating high-temperature reduction synthesis device protected by an argon atmosphere for combustion synthesis. After the synthesis reaction, the product is ground and sieved to obtain ZrB with a particle size of 6-10 μm 2 / Al 2 o 3 Ceramic composite powder. 5g ZrB 2 / Al 2 o 3 Add the composite powder into 50 ml of 0.5 mol / L cerium nitrate (yttrium nitrate, lanthanum nitrate, neodymium nitrate) aqueous solution at a temperature of 25° C. and stir evenly. The homogeneous slurry was then dried at 100 °C to obtain the precursor-coated ZrB 2 / Al2 o 3 Composite powder of powder. Calcine...

Embodiment 2

[0026] Take ZrO with a particle size of 60-70 μm 2 10g, 140~150μm B 2 o 3 10g and 50g of 100-150μm Al powder were placed in a ball mill for mechanical dry mixing for 12h, and the ball-to-material ratio was 3:1. Other conditions are the same as in Example 1, and the coated composite powder is also obtained, and the yttrium oxide (cerium oxide, lanthanum oxide, neodymium oxide) is evenly and densely coated, and the thickness of the coating layer is about 20-30 nm.

Embodiment 3

[0028] Take ZrO with a particle size of 60-65 μm, 100-120 μm, and 100-150 μm 2 , B 2 o 3 30g, 30g and 120g of Al powder were placed in a ball mill for ball milling and dry mixing for 9 hours, and the ball-to-material ratio was 2:1. The mixed material is pressed under a pressure of 10 MPa to form a green body with a density equivalent to 50% of the theoretical density. Then the green body is placed in a self-propagating high-temperature reduction synthesis device protected by an argon atmosphere for combustion synthesis. After the synthesis reaction, the product is ground and sieved to obtain ZrB with a particle size of 6-8 μm 2 / Al 2 o 3 Ceramic composite powder. 5g ZrB 2 / Al 2 o 3 Add the composite powder into 100ml, 1mol / L yttrium nitrate (cerium nitrate, lanthanum nitrate, neodymium nitrate) aqueous solution at a temperature of 30°C and stir evenly. The homogeneous slurry was then dried at 110 °C to obtain the precursor-coated ZrB 2 / Al 2 o 3 Composite powder o...

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Abstract

The invention relates to a preparation method of zirconium / aluminum trioxide compound powder which has anti-oxidant property and easily-sintered surface which is coated by nanometer rare earth oxide. The method is characterized in that the method includes the steps as follows: 1), balling-milling zirconium dioxide ZrO2, diboron trioxide B2O3 and metal Aluminum Al powder uniformly and molding and shaping, placing in a self-propagating high temperature synthesizer at room temperature under the protection of argon, igniting and burning, and obtaining high pure ZrB2 / Al2O3 ceramic compound powder after combustion products are grinded; 2) adding the ZrB2 / Al2O3 ceramic compound powder in rare earth salt solution, mixing into uniform slurry, drying and obtaining the compound powder of precursor ZrB2 / Al2O3 compound powder with the rare earth oxide coating layer; 3) sintering the compound powder at high temperature to obtain a final product. The invention has the advantages of simple operation, convenience and little energy and time consumption. The synthesized powder has the advantages of high purity, small grain, sintering easiness and good high temperature oxidation resistance.

Description

technical field [0001] The present invention relates to a preparation method of a ceramic composite powder with excellent high-temperature oxidation resistance and sintering performance, the surface of which is coated and modified by rare earth, in particular to a method for preparing rare earth modified zirconium diboride / aluminum oxide composite powder body method. Background technique [0002] Composite powders, especially composite powders with surface coating modification can greatly improve material properties, and have been widely used in the field of thermal coating [1] . Coating a layer of ultra-fine powder on the surface of the powder that is difficult to sinter and is easy to oxidize can increase the densification speed and density, and can also improve the high-temperature oxidation resistance of the powder. It has been widely confirmed [2] . [0003] ZrB 2 / Al 2 o 3 As a high-temperature composite ceramic, ceramics have been widely used in the fields of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/628C04B35/65
Inventor 于志强
Owner FUDAN UNIV
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