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Pink silicon nitride ceramic as well as preparation method and application thereof

A technology of silicon nitride ceramics and pink, which is applied in the fields of prosthesis, tissue regeneration, medical science, etc. It can solve the problems of changing the color of silicon nitride ceramics, low melting point of colorants, and hindering the densification of silicon nitride ceramics.

Inactive Publication Date: 2022-01-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most colorants have a low melting point and are easy to decompose during the sintering process of silicon nitride ceramics, which cannot be used to change the color of silicon nitride ceramics, and will hinder the densification of silicon nitride ceramics

Method used

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  • Pink silicon nitride ceramic as well as preparation method and application thereof
  • Pink silicon nitride ceramic as well as preparation method and application thereof
  • Pink silicon nitride ceramic as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0026] The preparation method of the pink silicon nitride ceramic is exemplarily described below.

[0027] α-Si 3 N 4 Powder is the starting material, Al 2 o 3 and Er 2 o 3 as a sintering aid, and Er 2 o 3 At the same time as a coloring agent, as a raw material powder. which controls Al 2 o 3 The content of the powder can be 0.71-2.78wt% of the total mass of raw material powder. Er 2 o 3 The content of the powder can be 3.91-8.82wt% of the total mass of raw material powder.

[0028] Si 3 N 4 The ball is used as the grinding medium, and the mixed powder is prepared by ball milling, drying, grinding, and sieving. As an example, using alcohol as a solvent, the above-mentioned raw materials are formulated into a slurry with a certain solid content, and Si 3 N 4 The ball is used as the grinding medium, and the mixed powder is prepared by ball milling, drying, grinding, and sieving. The rotational speed of the ball mill is 200-400rpm, and the milling time is 2-4h. ...

Embodiment 1

[0037] A kind of pink silicon nitride ceramics and preparation method thereof, comprises the following steps:

[0038] S1: Weigh 94g Si3 N 4 , 2.09gAl 2 o 3 and 3.91g Er 2 o 3 100g in total;

[0039] S2: the mixed powder in step S1 is configured into a slurry with a certain solid content, and the planetary ball mill is 2h, and the rotating speed is 400rpm;

[0040] S3: Grinding after drying the slurry obtained in step S2, passing through a 400-mesh sieve and preforming under a pressure of 10MPa by dry pressing, and then forming by cold isostatic pressing at 250MPa;

[0041] S4: the ceramic biscuit obtained in step S3 is put into a BN mould, and placed in a gas pressure sintering furnace, filled with N 2 As a protective gas, it was sintered at 1750°C and 3MPa pressure for 4h to obtain pink silicon nitride ceramics. The relative density of the obtained pink silicon nitride ceramics is 98.3%, the bending strength is 1186.7±18.6MPa, and the fracture toughness is 10.8±0.1MPa...

Embodiment 2

[0043] A kind of pink silicon nitride ceramics and preparation method thereof, comprises the following steps:

[0044] S1: Weigh 94g Si 3 N 4 , 0.71gAl 2 o 3 and 5.29g Er 2 o 3 100g in total;

[0045] S2: the mixed powder in step S1 is configured into a slurry with a certain solid content, and the planetary ball mill is 2h, and the rotating speed is 400rpm;

[0046] S3: Grinding the slurry obtained in step S2 after drying, passing through a 200-mesh sieve and preforming under a pressure of 20MPa by dry pressing, and then forming by cold isostatic pressing at 200MPa;

[0047] S4: the ceramic biscuit obtained in step S3 is put into a BN mould, and placed in a gas pressure sintering furnace, filled with N 2 As a protective gas, sintering at 1750°C and 2MPa pressure for 3h, the relative density is 97.6%, the bending strength is 1136.7±47.8MPa, the fracture toughness is 10.6±0.2MPa·m1 / 2, and the Vickers hardness is 15.28 ±0.14GPa. Tested by X-Rite Ci62 spectrophotometer, t...

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Abstract

The invention relates to pink silicon nitride ceramic as well as a preparation method and application thereof. According to the invention, Al2O3 and Er2O3 are used as sintering aids, and Er2O3 is used as a coloring agent at the same time, and the pink silicon nitride ceramic is obtained after air pressure sintering.

Description

technical field [0001] The present invention relates to a kind of pink silicon nitride ceramics and its preparation method and application, specifically, is based on Al 2 o 3 and E r2 o 3 as a sintering aid, and Er 2 o 3 At the same time, as a coloring agent, the pink silicon nitride ceramics with high strength, high hardness and high toughness characteristics obtained through air pressure sintering belong to the field of silicon nitride ceramics preparation. Background technique [0002] Silicon nitride ceramics has the advantages of low density, good mechanical properties, wear resistance, corrosion resistance and good biocompatibility, and is an ideal femoral ball head material. Due to the large band gap (3.5-5.5eV), silicon nitride itself is colorless. However, due to the influence of additives, the color of silicon nitride usually changes. For example, when employing a wide range of Al 2 o 3 -Y 2 o 3 When the system is used as a sintering aid, the color of si...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/645A61L27/10A61L27/50
CPCC04B35/5935A61L27/105A61L27/50A61L2430/02C04B2235/3217C04B2235/3224C04B2235/77C04B2235/96
Inventor 曾宇平魏悦梁汉琴左开慧夏咏锋姚冬旭尹金伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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