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Multiphase ceramics material with low density and high strength and preparation method thereof

A multi-phase ceramic, high-strength technology, applied in the field of ceramic materials, can solve the problems of incompatibility, many pores, poor mechanical properties, etc.

Inactive Publication Date: 2014-07-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sialon combines SiC as a high-quality refractory material with outstanding high-temperature performance, but due to more pores and poor mechanical properties, it is not suitable for armor materials

Method used

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  • Multiphase ceramics material with low density and high strength and preparation method thereof
  • Multiphase ceramics material with low density and high strength and preparation method thereof
  • Multiphase ceramics material with low density and high strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0059] Embodiment 1~7 sample composition

[0060]

[0061] Among them, micron SiC 1 (1μm≤D 50 ≤100μm, purity >98%), submicron SiC 2 (0.1μm≤D 50 98%), Si powder (0.1μm≤D 50 99%), industrial grade Al 2 o 3 (0.1μm≤D 50 2 (analytical pure), high-quality Suzhou soil (1μm≤D 50 ≤100μm), additive Y 2 o 3 , ZrO 2 , La 2 o 3 , MgO (0.5μm≤D 50 ≤10 μm, purity >99%).

[0062] Embodiment 1~7 preparation method: take ethanol as ball milling medium, use Si in planetary mill 3 N 4 Ball milling 24h (raw materials and additives, Si 3 N 4 The mass ratio of balls to ethanol is 1:1.5:1), and the ball-milled slurry is dried, granulated, sieved, dry-pressed (45-55MPa), debinding, and sintered in a high-temperature vacuum atmosphere Sintering in flowing high-purity nitrogen gas (purity > 99.99%) produces a low-density, high-strength composite ceramic material, that is, SiC / β-sialon composite ceramic.

Embodiment 1～2

[0064] The specific sintering method is to keep the temperature at 1500°C for 2 hours under flowing high-purity nitrogen gas (purity>99.99%) (nitrogen flow rate: 1-3L / min), and then rapidly heat up to 1650°C at a rate of 10°C / min Keep warm for 1h. In this method, the temperature used for debinding is 300° C., and the temperature is kept for 3 hours.

[0065] Examples 1-2 The apparent porosity of the ceramic material is 5-25%, 75%3 .

Embodiment 3～4

[0067] The specific sintering method is to keep the temperature at 1400°C for 3 hours under flowing high-purity nitrogen gas (purity>99.99%) (nitrogen flow rate: 1-3L / min), and then rapidly heat up to 1600°C at a rate of 15°C / min Keep warm for 3h. In this method, the temperature used for debinding is 400° C., and the temperature is kept for 2 hours.

[0068] Examples 3-4 The apparent porosity of the ceramic material is 5-20%, 75%3 .

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Abstract

The invention discloses a low-density, high-strength composite-phase ceramic material and a preparation method thereof. The material has a wide application range and is especially suitable for the field of armor protection. The ceramic material of the present invention mainly uses SiC, Si powder, Al2O3, Suzhou soil and SiO2 as raw materials, and is prepared by sintering with additives at a high temperature of 1400-1750°C under flowing nitrogen conditions; among them, Suzhou soil effectively promotes the formation of β-sialon phase The additives promote the sintering and densification of the sample. The volume density of the obtained ceramic material is about 75% of that of Al2O3 ceramic material, but its specific strength is about 40% higher than that of Al2O3 ceramic material.

Description

technical field [0001] The invention belongs to the field of ceramic materials, in particular to a low-density, high-strength composite ceramic material and a preparation method thereof. Background technique [0002] In modern warfare, more and more attention has been paid to the survivability of weapons, equipment and personnel, and the importance of armor protection has become increasingly prominent. High-performance ceramic materials play an important role in improving the protection ability of composite armor due to their advantages of high strength, high hardness, low density and corrosion resistance. Ceramic armor has become an important part of modern composite armor and is widely used in the field of armor protection for tanks, armored vehicles, armed helicopters and combatants [1-2] . At present, the most widely used armor ceramic materials are Al 2 o 3 , B 4 C and SiC etc. Al 2 o 3 Armor ceramics are widely used because of their simple preparation process a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 郭露村刘宁陈涵文有强
Owner NANJING TECH UNIV