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A preparation method of whisker self-toughened α-sialon ceramic material

A ceramic material and self-toughening technology, which is applied in the preparation field of whisker self-toughened α-SiAlON ceramic materials, can solve the problems of low flexural strength and insufficient toughness of α-Sialon ceramics, achieve less impurity phases, improve Excellent flexural strength, fracture toughness, and mechanical properties

Active Publication Date: 2020-01-14
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

[0009] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, especially the problems of low flexural strength and insufficient toughness of α-Sialon ceramics, and provide a ceramic with less impurity, high aspect ratio, and excellent anti-corrosion properties at the same time. Preparation method of whisker self-toughened α-SiAlON ceramic material with flexural strength, fracture toughness and hardness

Method used

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  • A preparation method of whisker self-toughened α-sialon ceramic material
  • A preparation method of whisker self-toughened α-sialon ceramic material

Examples

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Embodiment 1

[0031] A preparation method of whisker self-toughening α-SiAlON ceramic material of the present invention, comprises the following steps:

[0032] (1) Ingredients: According to the molecular formula Y m / 3 Si 12-(m+n) Al m+n o n N 16-n The stoichiometric ratio of weighing raw material powder α-Si 3 N 4 、Al 2 o 3 , Y 2 o 3 and AlN polytype powder, where m=0.3, n=0.6.

[0033] In this embodiment, the chemical composition of the AlN polytype powder is SiAl 5 o 2 N 5 , the preparation process is as follows: the raw materials Al, Si, Al 2 o 3 powder by SiAl 5 o 2 N 5 Carry out molar ratio, and add pore-forming agent (such as NH 4 F, etc., a small amount) mixed, in a nitrogen atmosphere, at 1600 ° C for 12 hours to obtain the AlN polytype.

[0034] (2) Preparation of mixed powder (including glue mixing): mix the raw material powder prepared in step (1) for ball milling, and at the same time add a molding agent (that is, glue mixing), and the molding agent accounts ...

Embodiment 2

[0040] A preparation method of whisker self-toughening α-SiAlON ceramic material of the present invention, comprises the following steps:

[0041] (1) Ingredients: According to the molecular formula Y m / 3 Si 12-(m+n) Al m+n o n N 16-n Weigh raw material powder α-Si 3 N 4 、Al 2 o 3 , Y 2 o 3 And AlN polytype, in the formula, m=0.6, n=0.8.

[0042] In this example, the chemical composition of the AlN polytype is SiAl 6 o 2 N 6 , the preparation process is as follows: the raw materials Al, Si, Al 2 o 3 powder by SiAl 6 o 2 N 6 Carry out molar ratio, and add pore-forming agent (such as NH 4 F, etc., a small amount) mixed, in a nitrogen atmosphere, at 1600 ° C for 12 hours to obtain the AlN polytype.

[0043] (2) Preparation of mixed powder: mix the raw material powder (i.e. powder) prepared in step (1) and perform ball milling, and at the same time add a molding agent (polyvinyl alcohol), and the molding agent accounts for the mass fraction of the obtained mixed...

Embodiment 3

[0049] A preparation method of whisker self-toughening α-SiAlON ceramic material of the present invention, comprises the following steps:

[0050] (1) Ingredients: According to the molecular formula Y m / 3 Si 12-(m+n) Al m+n o n N 16-n Weigh raw material powder α-Si 3 N 4 、Al 2 o 3 , Y 2 o 3 and AlN polytype powder, in the formula, m=0.6, n=0.6.

[0051] In this embodiment, the chemical composition of the AlN polytype powder is SiAl 8 o 2 N 8 , the preparation process is as follows: the raw materials Al, Si, Al 2 o 3 powder by SiAl 8 o 2 N 8 Carry out molar ratio, and add pore-forming agent (such as NH 4 F, etc., a small amount) mixed, in a nitrogen atmosphere, at 1600 ° C for 12 hours to obtain the AlN polytype.

[0052] (2) Preparation of mixed powder: Mix the raw material powders prepared in step (1) and then perform ball milling. At the same time, add a molding agent (polyvinyl alcohol). The mass fraction of the molding agent in the obtained mixed powder ...

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Abstract

The invention discloses a preparation method of a crystal whisker self-toughening alpha-SiAlON ceramic material. The preparation method comprises the following steps: mixing raw material powder alpha-Si3N4, Al2O3, Y2O3 and AlN polytype, doping glue and performing ball milling, pressing, discharging glue, heating and sintering, adopting vacuum atmosphere when the final sintering temperature is 1750to 1900 DEG C and T is higher than or equal to room temperature and lower than or equal to 1100 DEG C, adopting nitrogen pressure of 0.1 to 1 MPa when T is higher than or equal to 1100 DEG C and lower than or equal to 1700 DEG C, adopts nitrogen pressure of 2 to 8 MPa when T is higher than or equal to 1700 DEG C and lower than or equal to the final sintering temperature, and performing furnace cooling to room temperature to obtain the crystal whisker self-toughening alpha-SiAlON ceramic material. The crystal whisker self-toughening alpha-SiAlON ceramic material has few impure phases, high crystal whisker draw ratio and excellent mechanical property, and has excellent bending strength, fracture toughness and hardness.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and in particular relates to a preparation method of whisker self-toughening α-SiAlON ceramic material. Background technique [0002] SiAlON ceramics are based on Si 3 N 4 The general term for a class of solid solutions in the Si-Al-O-N system and related systems, the basic structural unit is (Si, Al) (O, N) tetrahedron. with Si 3 N 4 The difference is that the ions of the instantaneous liquid phase formed during the sintering process of SiAlON ceramics can enter the lattice to form the SiAlON phase in the later stage of sintering, so that the grain boundaries are purified, which is beneficial to improve the high temperature performance of the material. SiAlON ceramics is the most advantageous material for superalloy cutting, and Si 3 N 4 Compared with ceramic tool materials, SiAlON ceramic tools have higher oxidation resistance, chemical stability, creep resistance and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622C04B35/638
Inventor 银锐明王社权李礼薛瑞萌
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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