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Zirconia reinforced silicon nitride/quartz-matrix ceramic composite material and preparation method thereof

A technology of ceramic composite materials and silicon nitride, which is applied in the field of special ceramics, can solve the problems of poor dielectric and thermal shock resistance, low strength, etc., achieve good ablation resistance, meet application requirements, and be easy to implement.

Active Publication Date: 2009-12-02
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon nitride ceramic is one of the structural ceramic materials with the best comprehensive performance. It still has high bending strength at high temperature, excellent resistance to ablation and erosion, but poor dielectric and thermal shock resistance.
Although the introduction of the second phase silicon nitride into the quartz ceramic material can effectively improve the strength of the composite material, so that the strength of the composite material can reach 70-80MPa, but for the high Mach number missile radome material, silicon nitride / quartz ceramic The strength of composite materials is still relatively low

Method used

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  • Zirconia reinforced silicon nitride/quartz-matrix ceramic composite material and preparation method thereof
  • Zirconia reinforced silicon nitride/quartz-matrix ceramic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Raw materials used:

[0038] α-Si in silicon nitride powder 3 N 4 The weight content is 95%, f si 50 0.6μm;

[0039] In quartz powder, SiO 2 The weight content is 99%, amorphous, median particle size D 50 = 4.7 μm;

[0040] Nano ceramic powder is nano SiO 2 , amorphous, SiO 2 The weight content is 99%;

[0041] Zirconia powder, analytically pure, ZrO 2 The weight content is 99.1%, and the median particle size is 0.8μm;

[0042] Sintering aid is Y 2 o 3 , analytically pure, with a median particle size of 1.1 μm.

[0043] Weigh 130g of quartz powder, 54g of silicon nitride powder, 6g of sintering aid, 10g of nano-ceramic powder, 30g of zirconia powder, use deionized water as a dispersant, mix by ball milling, pass through a 180-mesh sieve, and pass through a centrifugal drying granulator Granules with a particle size of 100-500μm, and then evenly loaded into a special oil-resistant rubber mold, and molded in a wet cold isostatic press with a molding pressure ...

Embodiment 2

[0045] Raw materials used:

[0046] α-Si in silicon nitride powder 3 N 4 The weight content is 96%, f si 50 0.7μm;

[0047] In quartz powder, SiO 2 The weight content is 99%, amorphous, median particle size D 50 = 10 μm;

[0048] Nano ceramic powder is nano SiO 2 , amorphous, SiO 2 The weight content is 99.6%;

[0049] Zirconia powder, analytically pure, ZrO 2 The weight content is 99.5%, and the median particle size is 1 μm;

[0050] Sintering aid is Al 2 o 3 , analytically pure, with a median particle size of 0.9 μm.

[0051]Weigh 130g of quartz powder, 54g of silicon nitride powder, 6g of sintering aid, 10g of nano-ceramic powder, 20g of zirconia powder, use deionized water as a dispersant, mix by ball milling, pass through a 180-mesh sieve, and pass through a centrifugal drying granulator Granules with a particle size of 100-500μm, and then evenly loaded into a special oil-resistant rubber mold, and molded in a wet cold isostatic press with a molding pressure ...

Embodiment 3

[0053] Raw materials used:

[0054] α-Si in silicon nitride powder 3 N 4 The weight content of 93%, f si 50 0.6μm;

[0055] In quartz powder, SiO 2 The weight content is 99%, amorphous, median particle size D 50 = 6 μm;

[0056] Nano ceramic powder is nano SiO 2 , amorphous, SiO 2 99.1% by weight;

[0057] Zirconia powder, analytically pure, ZrO 2 The weight content is 99.1%, and the median particle size is 1 μm;

[0058] Sintering aid is Y 2 o 3 , analytically pure, with a median particle size of 1.3 μm.

[0059] Weigh 130g of quartz powder, 54g of silicon nitride powder, 6g of sintering aid, 10g of nano-ceramic powder, 20g of zirconia powder, use deionized water as a dispersant, mix with a ball mill, pass through a 180-mesh sieve, dry, and press to produce a particle size 100-500μm, and then uniformly loaded into a special oil-resistant rubber mold, and molded in a wet cold isostatic press with a molding pressure of 150MPa. The formed test pieces were fired in ...

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Abstract

The invention relates to a zirconia reinforced silicon nitride / quartz-matrix ceramic composite material, and belongs to the technical field of special ceramics. The composite material comprises the following compositions by weight: 60 to 80 percent of quartz powder, 10 to 30 percent of silicon nitride powder, 2 to 15 percent of nano ceramic powder, 1 to 10 percent of sintering auxiliary agent and 5 to 20 percent of zirconia powder. The preparation method comprises the following steps: adopting deionized water as dispersing medium and silicon nitride ceramic balls as grinding medium; mixing and grinding the compositions in a polyurethane ball milling jar for 10 to 20h to prepare shaped granular material with the grain diameter between 100 and 500 mu m; preparing a biscuit through press forming; and preparing the composite material through pressureless baking in nitrogen atmosphere. The zirconia reinforced silicon nitride / quartz-matrix ceramic composite material has the advantages that the composite material has strong temperature resistance, excellent ablation resistance, excellent mechanical property and dielectric property and high intensity and can meet the requirements of application; moreover, the preparation method is scientific, reasonable and simple.

Description

technical field [0001] The invention relates to a zirconia-reinforced silicon nitride / quartz-based ceramic composite material and a preparation method thereof, belonging to the technical field of special ceramics. Background technique [0002] The missile radome is a key component to ensure the normal operation of the radar antenna system. It is not only a component of the missile body, but also a component of the radar guidance system; In harsh environments, it is also necessary to meet the performance requirements of the missile radar system on power transfer coefficient, aiming error and antenna pattern distortion. With the development of aerospace and aviation technology, radome materials have developed towards high temperature resistance, erosion resistance, meeting broadband requirements and high wave transmittance. In recent years, high-performance ceramic wave-transparent materials have gradually occupied an absolute dominant position in supersonic and hypersonic ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/78C04B35/14C04B35/622
Inventor 王重海程之强翟萍王卫陈达谦李伶张训虎高芳
Owner ZHONGCAI HIGH NEW MATERIAL
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