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A kind of alumina ceramic sintered body and its preparation method and application

A technology of alumina ceramics and sintered bodies, applied in the field of alumina ceramics, can solve the problems of difficult to effectively control columnar crystals, limited improvement of alumina ceramics, influence on the properties of alumina ceramics, etc., to achieve excellent mechanical properties, easy and controllable production , the effect of high fracture toughness

Active Publication Date: 2022-05-06
CHAOZHOU THREE CIRCLE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Disadvantages: The current in-situ toughening research has a limited degree of improvement in the fracture toughness of alumina ceramics, and the columnar crystals are difficult to effectively control and inevitably affect other properties of alumina ceramics

Method used

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  • A kind of alumina ceramic sintered body and its preparation method and application
  • A kind of alumina ceramic sintered body and its preparation method and application
  • A kind of alumina ceramic sintered body and its preparation method and application

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preparation example Construction

[0065] The preparation method of embodiment 1~8 and comparative example 1~4 is:

[0066] 1) Weigh the raw materials according to the proportion, fully mix the cerium oxide and niobium oxide, and then mix them with high-purity Al 2 o 3 Powder mixing, adding alcohol and corundum balls for wet grinding and mixing, the volume ratio of powder, corundum balls and solvent is 2:4:7, the ball mill adopts planetary ball mill, the diameter of corundum balls is at least one of Φ10, and the control ball The material ratio is 3.2, the speed of the ball mill is 600r / min, the ball milling time is 36h, the solvent is isopropanol and toluene, after the ball milling is completed, the suspension is taken out, placed in a constant temperature drying oven at 90°C, and then the material is pulverized, passed through 100 The mesh screen is ready for use;

[0067] 2) Put the above-mentioned mixed powder into a desktop tablet press and press to form a green body, then put the green body at 1500°C for...

Embodiment 6

[0073] In embodiment 6, it is the best effect of the above embodiments. The possible reason is that if the content distribution of cerium oxide is low, the CeAl formed 11 o 18 Less content leads to weakened toughening effect. That is, the alumina substrate has the most Good fracture toughness and flexural strength.

[0074] Simultaneously, carry out scanning electron microscope (SEM) figure observation after the thermal corrosion of columnar aluminum oxide crystal grain in embodiment 6, as figure 1 As shown, it can be seen that the alumina grains mainly present a columnar appearance distribution, and the aspect ratio is greater than 3. It proves that the equiaxed alumina grains in the experiment do grow into columns in situ under the action of additives, so as to achieve the toughening effect. Embodiment 6 is tested according to the Weibull distribution of three-point bending method intensity, as figure 2 As shown, it can be seen that its strength is 486.1MPa through th...

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Abstract

The invention relates to an alumina ceramic sintered body, which comprises alumina, a cerium-containing compound (calculated in the form of cerium oxide) and a niobium-containing compound (calculated in the form of niobium oxide) with a mass fraction of 85.6-95.2%, and the cerium-containing compound The mass fraction (calculated as cerium oxide) is higher than the mass fraction of niobium-containing compounds (calculated as niobium oxide). The present invention uses high-purity α-Al 2 o 3 Particles as raw material, with Ce 2 o 3 and Nb 2 o 5 As an additive, the additive Ce in the sintering process 2 o 3 and Nb 2 o 5 Will generate CeNbO 4 As a liquid phase, the sintering temperature of the composite ceramic is significantly reduced, the interface reaction is promoted, and the alumina grain grows anisotropically into a columnar shape; the columnar crystal mainly realizes the synergy of the composite ceramic by deflecting the crack and pulling out the columnar crystal to absorb energy. Toughening, reducing the crack tip propagation energy, so that the ceramic material has higher fracture toughness.

Description

technical field [0001] The invention relates to an alumina ceramic sintered body, a preparation method and application thereof, and belongs to the technical field of alumina ceramics. Background technique [0002] Alumina ceramics have a series of excellent properties such as high strength, high hardness, high temperature resistance, wear resistance, and corrosion resistance, and their raw materials have a wide range of sources and low manufacturing costs, so alumina ceramics are widely used. However, after the alumina grains are fired at high temperature, the microstructure is equiaxed, and the grain size is >5um, resulting in low fracture toughness, usually only 3-4MPa m 1 / 2 , this defect greatly limits the application range of alumina ceramics. Therefore, a large number of scholars at home and abroad have invested in research in order to improve the toughness of alumina ceramics. [0003] At present, the toughening mechanism of alumina ceramics mainly includes phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64C04B41/88
CPCC04B35/10C04B35/622C04B35/64C04B41/88C04B41/5127C04B2235/3229C04B2235/3222C04B2235/3255C04B2235/656C04B2235/6567C04B2235/667C04B2235/786C04B2235/788C04B2235/96
Inventor 邱基华黄雪云江楠
Owner CHAOZHOU THREE CIRCLE GRP
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