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High tenacity alumina base composite ceramic and preparation method thereof

An alumina-based and composite ceramic technology, applied in the field of alumina-based composite ceramics, can solve the problems of complex preparation process, unfavorable energy saving and emission reduction, long sintering time, etc., and achieve the effect of simple process and large industrial application value.

Inactive Publication Date: 2012-06-27
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

But still need to synthesize LaNbO 4 later with A1 2 o 3 Mixing, molding, and finally hot-pressing sintering or conventional sintering, not only the preparation process is complicated, but also the sintering temperature is high (above 1700°C), the sintering time is long (above 3h), and the energy consumption is high, which is not conducive to energy saving and emission reduction

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  • High tenacity alumina base composite ceramic and preparation method thereof

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Embodiment 1

[0020] Nb with a purity of more than 99.5wt% 2 o 5 , La 2 o 3 、Al 2 o 3 The powder is weighed according to the weight percentage of each embodiment in Table 1, and the medium is mixed with absolute ethanol for 12h by wet milling, and after drying, add 8wt% polyvinyl alcohol (PVA) aqueous solution (concentration is 5wt%) after granulation , under the pressure of 180MPa, it is formed into a green body by uniaxial pressure molding. After being kept at 600°C for 1h in a box-type furnace, it is placed in a 2.4GHz microwave sintering furnace and raised to 1450°C or 1500°C at a speed of 15°C / min. ℃ for 30 minutes to sinter into porcelain, and the sintering atmosphere is atmospheric. The fracture toughness was measured according to the national standard GB / T 23806-2009.

[0021] The composition, sintering process and fracture toughness of the alumina-based composite ceramics in the examples are shown in Table 1.

[0022] Table 1 Composition and properties of alumina matrix comp...

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Abstract

Provided are a high tenacity alumina base composite ceramic and a preparation method thereof. Weight percentage content of each component is respectively 4.0wt.%<=x<=29.0wt.% of lanthana (La2O3), 2.5wt.%<=y<=21.5wt.% of niobium oxide (Nb2O5) and 52.0wt.%<=z<=93.0wt.% of alumina (AI2O3). The high tenacity alumina base composite ceramic adopts raw materials without any component which damages human healthy and pollutes the environment, fracture toughness of the high tenacity alumina base composite ceramic is all larger than 5MPa.m1 / 2, the high tenacity alumina base composite ceramic can be widely applied to ceramic cylinder sleeves, ceramic bearings and other engine wear parts and ceramic cutting tools. The high tenacity alumina base composite ceramic is simple in process, safe, free of pollution and saving in energy and time, sintering time is 1 / 6-1 / 4 of conventional sintering only, sintering temperature is 15-300 DEG C lower than the conventional sintering, and the high tenacity alumina base composite ceramic has great industrial application value.

Description

technical field [0001] The invention relates to an alumina-based composite ceramic, in particular to a high-toughness alumina-based composite ceramic and a preparation method thereof. Background technique [0002] A1 2 o 3 Ceramic is the most widely used type of structural ceramics, and is known as the "King of Ceramics". It has the characteristics of high melting point, high elastic modulus, high hardness, good chemical stability, heat resistance, corrosion resistance, wear resistance, low density, light weight and cheap price. It is not only used as a circuit substrate material in the electronics industry, It is widely used in engine parts materials, and it has also achieved remarkable results as a high-temperature-resistant, corrosion-resistant, and wear-resistant mechanical parts material to replace metals and alloys. However, the fracture toughness of this material is very low, usually only 3MPa m 1 / 2 , which affects the working reliability and safety of ceramic pa...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 艾云龙何菲梁炳亮陈卫华何文
Owner NANCHANG HANGKONG UNIVERSITY
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