Alumina ceramic powder, alumina ceramic and preparation method of alumina ceramic

A technology of alumina ceramic powder and alumina ceramics, applied in the field of ceramics, can solve the problems of affecting the service life of resistors and being susceptible to force fracture.

Active Publication Date: 2016-05-18
SHENZHEN SUNTECH ADVANCED CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the alumina ceramic rods used for precision resistors are generally made of 96% alumina, but their bending strength is only about 300 M

Method used

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  • Alumina ceramic powder, alumina ceramic and preparation method of alumina ceramic

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Experimental program
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Example Embodiment

[0028] Such as figure 1 As shown, the preparation method of alumina ceramics in one embodiment includes the following steps:

[0029] Step S110: Weigh the components according to the following mass percentages: 85%-95% alumina powder, 2%-6% titanium dioxide powder, 2.5%-8% magnesium oxide powder and 0.5%-1.5% nanometer Ceramic powder.

[0030] Further, weigh the components according to the following mass percentages: 91%-95% alumina powder, 2%-3.5% titanium dioxide powder, 2.5%-5% magnesium oxide powder and 0.5%-1.0% nanometer Ceramic powder.

[0031] Among them, the nano ceramic powder is chromium oxide powder or silicon nitride powder.

[0032] The aluminum oxide powder is doped and modified with titanium dioxide powder and magnesium oxide powder. Titanium dioxide and magnesium oxide can be distributed in the form of glass phase at the grain boundaries of alumina ceramics, thereby greatly enhancing the slidability between alumina grains , So that the material exhibits higher frac...

Example Embodiment

[0045] Example 1

[0046] The preparation process of the alumina ceramic of this embodiment is as follows:

[0047] (1) Weigh the components according to the following mass percentages: 95% aluminum oxide powder, 2% titanium dioxide powder, 2.5% magnesium oxide powder and 0.5% nano-chromium oxide powder, among which, aluminum oxide powder and titanium dioxide powder , The particle size of the magnesium oxide powder is 0.5-1 micron, and the particle size of the nano-chromium oxide powder is 10-25 nanometers.

[0048] (2) Alumina powder, titanium dioxide powder, magnesium oxide powder and nano chromium oxide powder are loaded into a ball mill, ethanol is added, and zirconia balls are used as the ball milling medium. Ball mill mixing at a rate of 300 revolutions / minute for 30 hours to obtain a slurry, which is naturally dried for 10 hours, and then dried in an oven at 50° C. for 12 hours to obtain a raw meal powder with a mass moisture content of less than 1%.

[0049] (3) Pass the raw ...

Example Embodiment

[0051] Example 2

[0052] The preparation process of the alumina ceramic of this embodiment is as follows:

[0053] (1) Weigh the components according to the following mass percentages: 91% alumina powder, 3.5% titanium dioxide powder, 5% magnesium oxide powder and 0.5% nano silicon nitride powder, among which, alumina powder, titanium dioxide The particle size of the powder and the magnesium oxide powder are both 1 to 2 microns, and the particle size of the nano silicon nitride powder is 30 to 40 nanometers.

[0054] (2) Load alumina powder, titanium dioxide powder, magnesium oxide powder and nano silicon nitride powder into a ball mill, add water as a solvent, and zirconia balls as a ball mill medium. Ball mill mixing at a rate of 300 revolutions per minute for 30 hours to obtain slurry. The slurry was naturally dried for 10 hours, and then dried in an oven at 50°C for 12 hours to obtain raw meal powder.

[0055] (3) Pass the raw meal powder obtained in step (2) through a 100-mesh...

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Abstract

The invention relates to alumina ceramic powder, alumina ceramic and a preparation method of the alumina ceramic. The alumina ceramic powder comprises components in percentage by mass as follows: 85%-95% of alumina powder, 2%-6% of titanium dioxide powder, 2.5%-8% of magnesia powder and 0.5%-1.5% of nano-ceramic powder which is chromium oxide powder or silicon nitride powder. The alumina ceramic with better bending strength can be prepared from the alumina ceramic powder.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to an alumina ceramic and a preparation method thereof. Background technique [0002] At present, the alumina ceramic rods used for precision resistors are generally made of 96% alumina, but their bending strength is only about 300 MPa, and the alumina ceramic rods of this strength are easy to break under force during assembly and use. Directly affect the service life of the resistor. Contents of the invention [0003] Based on this, it is necessary to provide an alumina ceramic powder, which can prepare alumina ceramics with higher bending strength. [0004] In addition, an alumina ceramic and a preparation method thereof are also provided. [0005] An alumina ceramic powder, comprising: 85% to 95% of alumina powder, 2% to 6% of titanium dioxide powder, 2.5% to 8% of magnesium oxide powder and 0.5% to 1.5% of Nano-ceramic powder, wherein the nano-ceramic powder is chromium oxide powder...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B2235/3206C04B2235/3232C04B2235/3241C04B2235/3873C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/666C04B2235/96
Inventor 向绍斌向其军谭毅成黄龙
Owner SHENZHEN SUNTECH ADVANCED CERAMICS
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