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SiAlON ceramic containing crystalline phase Y4SiAlO8N, and preparation method and application thereof

A crystalline phase and ceramic technology is applied in the field of SiAlON ceramics containing crystalline phases and their preparation, which can solve the problems of decreased toughness of SiAlON ceramics, and achieve the effects of reducing material cost, prolonging service life, and improving high temperature stability and oxidation resistance.

Active Publication Date: 2014-02-26
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the crystalline phase Y 4 SiAlO 8 The toughness of SiAlON ceramics will decrease with the increase of N content

Method used

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  • SiAlON ceramic containing crystalline phase Y4SiAlO8N, and preparation method and application thereof
  • SiAlON ceramic containing crystalline phase Y4SiAlO8N, and preparation method and application thereof
  • SiAlON ceramic containing crystalline phase Y4SiAlO8N, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A kind of containing crystalline phase Y of the present invention 4 SiAlO 8 N SiAlON ceramics, in the crystal phase structure of SiAlON ceramics, SiAlON is the main phase crystal, and there is a crystal phase Y at the grain boundary of the main phase crystal 4 SiAlO 8 N, and the main phase crystal SiAlON is mainly a composite phase of α-SiAlON and β-SiAlON, and α-SiAlON contains α-Si 3 N 4 , β-SiAlON contains β-Si 3 N 4 (See figure 1 ). After X-ray diffraction of SiAlON ceramics in this example, the peak intensity of α-SiAlON near 2θ=34.2° is X, and the peak intensity of β-SiAlON near 2θ=33.5° is Y, Y 4 SiAlO 8 The peak intensity Z of N around 2θ=29.4°, and Y / X=4.79, Z / X=0.79.

[0036] The preparation method of the present embodiment SiAlON ceramics, comprises the following steps:

[0037] (1) According to Si powder 67wt%, α-Si 3 N 4 Powder 12wt%, Al 2 o 3 Powder 4wt%, AlN powder 8.5wt%, Y 2 o 3 Powder 8.5wt% weighed, the above powder particle size D 50...

Embodiment 2

[0043] A kind of containing crystalline phase Y of the present invention 4 SiAlO 8 N SiAlON ceramics, in the crystal phase structure of SiAlON ceramics, SiAlON is the main phase crystal, and there is a crystal phase Y at the grain boundary of the main phase crystal 4 SiAlO 8 N, and the main phase crystal SiAlON is mainly a composite phase of α-SiAlON and β-SiAlON, and α-SiAlON contains α-Si 3 N 4 , β-SiAlON contains β-Si 3 N 4 (see figure 1 ). After X-ray diffraction of SiAlON ceramics in this example, the peak intensity of α-SiAlON near 2θ=34.2° is X, and the peak intensity of β-SiAlON near 2θ=33.5° is Y, Y 4 SiAlO 8 The peak intensity Z of N around 2θ=29.4°, and Y / X=0.84, Z / X=0.32.

[0044] The preparation method of the present embodiment SiAlON ceramics, comprises the following steps:

[0045] (1) According to Si powder 67wt%, α-Si 3 N 4 Powder 12wt%, Al 2 o 3 Powder 4wt%, AlN powder 8.5wt%, Y 2 o 3 Powder 8.5wt% weighed, the above powder particle size D 50...

Embodiment 3

[0051] A kind of containing crystalline phase Y of the present invention 4 SiAlO 8 N SiAlON ceramics, in the crystal phase structure of SiAlON ceramics, SiAlON is the main phase crystal, and there is a crystal phase Y at the grain boundary of the main phase crystal 4 SiAlO 8 N, and the main phase crystal SiAlON is mainly a composite phase of α-SiAlON and β-SiAlON, and α-SiAlON contains α-Si 3 N 4 , β-SiAlON contains β-Si 3 N 4 (see figure 1 ). After X-ray diffraction of SiAlON ceramics in this example, the peak intensity of α-SiAlON near 2θ=34.2° is X, and the peak intensity of β-SiAlON near 2θ=33.5° is Y, Y 4 SiAlO 8 The peak intensity Z of N near 2θ=29.4°, and Y / X=0, Z / X=0.32.

[0052] The preparation method of the present embodiment SiAlON ceramics, comprises the following steps:

[0053] (1) According to Si powder 54.4wt%, α-Si 3 N 4 Powder 9.6wt%, Al 2 o 3 Powder 4.5wt%, AlN powder 19.5wt%, Y 2 o3 Powder 12wt% weighed, the above powder particle size D 50 ...

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Abstract

The invention discloses a SiAlON ceramic containing crystalline phase Y4SiAlO8N. In the crystalline phase structure of the ceramic, main phase crystals mainly comprise alpha-SiAlON or an alpha-SiAlON and beta-SiAlON composite phase, Y4SiAlO8N exists in the crystal boundary of the main phase crystals, an alpha phase contains alpha-Si3N4, and a beta phase contains beta-Si3N4. A preparation method of the SiAlON ceramic comprises the following steps: uniformly mixing raw materials according to a ratio, adding an organic solvent and an adhesive, and ball-milling to obtain a mixed slurry; carrying out spray drying granulation of the mixed slurry, carrying out compression molding, and degreasing to form a green compact; and pre-burning the green compact in nitrogen atmosphere, carrying out furnace cooling, carrying out sintering heat-insulation of the obtained pre-burned body in the nitrogen atmosphere, and carrying out furnace cooling to obtain the SiAlON ceramic. The SiAlON ceramic has a good high-temperature stability and a good oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a SiAlON ceramic containing a crystalline phase and a preparation method and application thereof. Background technique [0002] SiAlON ceramics came out in the early 1970s, and then developed rapidly, gradually becoming an important high-temperature structural material. It is based on Si 3 N 4 The general term for a class of solid solutions in Si-Al-O-N systems based on Si-Al-O-N and related systems. The basic structural unit is (Si, Al) (O, N) tetrahedron. [0003] Si 3 N 4 It is a covalent bond crystal, the self-diffusion coefficient is very small, and it is not easy to sinter densely. It needs to add MgO, CaO, Y 2 o 3 etc. and some rare earth metal oxides as sintering aids. During the sintering process, these sintering aids can combine with Si at high temperature 3 N 4 SiO contained in the powder 2 Such impurities form a liquid phase, which acce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/622
Inventor 银锐明王社权左锐曾荣
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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