High-performance silicon nitride ceramic mobile phone rear cover material as well as preparation method and application thereof

A silicon nitride ceramic and mobile phone back cover technology is applied in the field of high-performance silicon nitride ceramic mobile phone back cover material and its preparation field, which can solve the problems of reducing strength, wear resistance, appearance, etc. High toughness, the effect of improving ceramic properties

Inactive Publication Date: 2018-11-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials are used to improve the overall toughness of the back cover of the mobile phone. Excessively improving its toughness will most likely reduce its strength, wear resistance, appearance, etc.
Si 3 N 4 As a high-temperature and easily decomposed substance, people are interested in Si 3 N 4 The research on sintering densification mainly focuses on high pressure to prevent decomposition and mechanical pressure to promote densification, however, there is no report on Si 3 N 4 Research on Negative Pressure and Even High Vacuum Sintering of Ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of a high-performance silicon nitride ceramic mobile phone back cover, the specific method is as follows:

[0029] (1) with Si 3 N 4 powder as raw material, Si 3 N 4 The purity of the powder is 99%, and the particle size is 0.1 μm; as MgO-Y 2 o 3 As a sintering aid, the purity of MgO powder is 99.9%, Y 2 o 3 The purity is 99.9%. Press Si 3 N 4 : MgO-Y 2 o 3 The mass fraction ratio is 90%: 10% mixed with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, mixed on the planetary ball mill for 8 hours, and after drying, Si 3 N 4 -MgO-Y 2 o 3 The mixed powder is recorded as powder A; the MgO-Y 2 o 3 MgO in:Y 2 o 3 The mass fraction ratio is 55%: 45%; pure Si 3 N 4 The powder obtained by the same mixing and drying process as above is designated as powder B.

[0030] (2) Put powder A: powder B in the ratio of 80vol%:20vol%, sequentially add them into the hot-press sintering furnace, keep warm at 1300°C for 60min, pressur...

Embodiment 2

[0033] According to Si 3 N 4 : MgO-Yb 2 o 3 The mass fraction ratio is 80%: 20% for batching, where Si 3 N 4 The particle size of the powder is 30nm, MgO:Yb 2 o 3 The mass fraction ratio is 60%:40%, and the ratio of powder A:powder B is 90vol%:10vol%. Prepare Si according to embodiment 1 method 3 N 4 Gradient ceramics, where the sintering process is: heating to 1200°C for 5 minutes in a spark plasma sintering furnace, mechanically pressurized at 50MPa, and nitrogen pressure at 10 3 Pa. In this example, the high-performance silicon nitride ceramic mobile phone back cover material has a relative density of 99%, a surface hardness of 26GPa, and a fracture toughness of 10MPa·m 1 / 2 , the bending strength is 1400Mpa; finally, the high-performance silicon nitride ceramic mobile phone back cover product is obtained after cutting, rough grinding, fine grinding and polishing processes.

Embodiment 3

[0035] According to Si 3 N 4 : MgO-La 2 o 3 The mass fraction ratio is 90%: 10% for batching, where Si 3 N 4 The particle size of the powder is 10nm, MgO:Yb 2 o 3 The mass fraction ratio is 60%:40%, and the ratio of powder A:powder B is 90vol%:10vol%. Prepare Si according to embodiment 1 method 3 N 4 Gradient ceramics, where the sintering process is: heating to 1000°C for 5 minutes in a spark plasma sintering furnace, mechanically pressurized at 50MPa, and nitrogen pressure at 10 2 Pa. In this example, the high-performance silicon nitride ceramic mobile phone back cover material has a relative density of 99%, a surface hardness of 28GPa, and a fracture toughness of 12MPa·m 1 / 2 , the bending strength is 1500Mpa; finally, the high-performance silicon nitride ceramic mobile phone back cover product is obtained after cutting, rough grinding, fine grinding and polishing processes.

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Abstract

The invention belongs to the field of non-oxide ceramic materials and discloses a high-performance silicon nitride ceramic mobile phone rear cover material as well as a preparation method and application thereof. The preparation method disclosed by the invention comprises the following steps: mixing and drying Si3N4 and MgO-Re2O3 to obtain powder A; performing the same mixing process on the pure Si3N4 powder, drying to obtain the powder B, sequentially filling the powder A and the powder B into a sintering furnace, and preparing the high-performance Si3N4 ceramic gradient material which is hard in surface and tough in interior in a nitrogen atmosphere, wherein the nitrogen pressure is a negative pressure. The relative density of the prepared Si3N4 ceramics is higher than 95%, the surface hardness is 18-30GPa, the breaking tenacity of the inner layer is 10-20MPa.m<1/2>, and the overall bending strength is 1200-1500MPa. According to the method disclosed by the invention, preparation of the high-performance Si3N4 gradient ceramics is realized. Finally, the high-performance silicon nitride ceramic mobile phone rear cover product is prepared by cutting, coarse grinding, accurate grinding and polishing.

Description

technical field [0001] The invention belongs to the field of non-oxide ceramic materials, and specifically discloses a high-performance silicon nitride ceramic mobile phone back cover material and a preparation method and application thereof. Background technique [0002] At present, smart phones have become an indispensable part of people's lives, and people are paying more and more attention to the protection and optimization of mobile phones. Mobile phone shells play a very important role in the protection of mobile phones, preventing mobile phones from being damaged and worn out when they fall. The most direct way. At the same time, the back cover of the mobile phone also affects important factors such as heat dissipation, light weight, and aesthetics. Therefore, the material used for the back cover of the mobile phone needs to have the characteristics of high strength, heat resistance, wear resistance, and beautiful appearance. In the existing market, the materials us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622
CPCC04B35/584C04B35/622C04B2235/656C04B2235/6567C04B2235/658C04B2235/6581C04B2235/77C04B2235/96
Inventor 郭伟明吴利翔牛文彬曾令勇林华泰
Owner GUANGDONG UNIV OF TECH
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