ZrB2-SiC-Cf ultra-high temperature ceramic composite material and preparation method thereof

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of ZrB2-SiC-Cf ultra-high temperature ceramic composite materials and its preparation, can solve the problems of hindering low-temperature densification of powders, rapid grain growth, serious agglomeration, etc. The effect of suppressing structural damage

Inactive Publication Date: 2016-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the particle size of the powder is reduced to the nanometer level, it will cause the agglomeration of the powder, and the degree of agglomeration is more serious as the particle size of the powder decreases.
The agglomeration of the powder will cause the preferential sintering of the agglomerates and the rapid growth of the grains during the sintering process, which hinders the low-temperature densification of the powder and leads to the inhomogeneity of the microstructure of the sintered body

Method used

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  • ZrB2-SiC-Cf ultra-high temperature ceramic composite material and preparation method thereof
  • ZrB2-SiC-Cf ultra-high temperature ceramic composite material and preparation method thereof

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specific Embodiment approach 1

[0016] Specific embodiment one: a kind of ZrB in this embodiment 2 -SiC-C f The preparation method of ultra-high temperature ceramic composite material is carried out according to the following steps:

[0017] Step 1, ZrB with an average particle diameter of 150nm 2 Powder, SiC powder with an average particle size of 200nm and carbon fiber were added to absolute ethanol (the volume of absolute ethanol was about 30 times the total volume of powder and fiber), and ultrasonic cleaning was performed for about 30 minutes; where ZrB 2 The volume fraction of SiC is 60%, the volume fraction of SiC is 20%, and the volume fraction of carbon fiber is 20%;

[0018] Step 2, then pour it into a polytetrafluoroethylene ball mill jar for ball milling for 10 hours, and use WC balls as the milling balls. The ball milling speed is 220r / min, and then the rotary evaporator is used to rotate and dry in vacuum at a speed of 35r / min and a temperature of 80°C to obtain powder A;

[0019] Step 3. G...

specific Embodiment approach 2

[0021] Specific embodiment two: a kind of ZrB in this embodiment 2 -SiC-C f The preparation method of ultra-high temperature ceramic composite material is carried out according to the following steps:

[0022] Step 1, ZrB with an average particle diameter of 150nm 2 Powder, SiC powder and carbon fiber with an average particle size of 500nm were added to absolute ethanol (the volume of absolute ethanol was about 30 times the total volume of powder and fiber), and ultrasonic cleaning was performed for about 30 minutes; where ZrB 2 The volume fraction of SiC is 60%, the volume fraction of SiC is 20%, and the volume fraction of carbon fiber is 20%;

[0023] Step 2, then pour it into a polytetrafluoroethylene ball mill jar for ball milling for 10 hours, and use WC balls as the milling balls. The ball milling speed is 220r / min, and then the rotary evaporator is used to rotate and dry in vacuum at a speed of 35r / min and a temperature of 80°C to obtain powder A;

[0024] Step 3. G...

specific Embodiment approach 3

[0026] Specific embodiment three: a kind of ZrB in this embodiment 2 -SiC-C f The preparation method of ultra-high temperature ceramic composite material is carried out according to the following steps:

[0027] Step 1, ZrB with an average particle diameter of 150nm 2 Powder, SiC powder and carbon fiber with an average particle size of 500nm were added to absolute ethanol (the volume of absolute ethanol was about 30 times the total volume of powder and fiber), and ultrasonic cleaning was performed for about 30 minutes; where ZrB 2 The volume fraction of SiC is 50%, the volume fraction of SiC is 20%, and the volume fraction of carbon fiber is 30%;

[0028] Step 2, then pour it into a polytetrafluoroethylene ball mill jar for ball milling for 10 hours, and use WC balls as the milling balls. The ball milling speed is 220r / min, and then the rotary evaporator is used to rotate and dry in vacuum at a speed of 35r / min and a temperature of 80°C to obtain powder A;

[0029] Step 3. G...

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Abstract

The invention discloses a ZrB 2 -SiC-C f The invention relates to an ultra-high temperature ceramic composite material and a preparation method thereof, belonging to the field of ultra-high temperature ceramic composite materials. The present invention aims to overcome ZrB 2 Intrinsic brittleness of base ultra-high temperature ceramics. The composite material of the present invention is composed of 30% to 60% ZrB with a particle size of 100 to 200 nm by volume fraction 2 Powder, 15% to 30% SiC powder with a particle size of 100 to 500nm and 20% to 50% carbon fiber. Method: 1. ZrB 2 Add the powder, SiC powder and carbon fiber into absolute ethanol, and perform ultrasonic cleaning; 2. Then ball mill and dry; Pressing and sintering, and then cooling to room temperature, ZrB 2 -SiC-C f Ultra-high temperature ceramic composite materials. The invention has the characteristics of low sintering temperature, small fiber damage, high damage strain of composite material, etc.; the sintering temperature of the invention is 1400-1500 DEG C. The ultra-high temperature ceramic composite material of the invention can be applied to the fields of ultra-high temperature heat-resistant structural materials and the like.

Description

technical field [0001] The invention belongs to the field of ultra-high temperature ceramic composite materials; specifically relates to a ZrB 2 -SiC-C f Ultra-high temperature ceramic composite material and its preparation method. Background technique [0002] Ultra-high temperature ceramics mainly include borides, carbides and nitrides of some transition metals (such as: ZrB 2 , HfB 2 , TaC, HfC, ZrC, HfN, etc.), their melting points are above 3000 ° C, which is a very potential ultra-high temperature heat-resistant structural material. Among these ultrahigh temperature ceramics, ZrB 2 Due to its high thermal conductivity, moderate thermal expansion coefficient and good oxidation and ablation resistance, the base ultra-high temperature ceramic has become a very promising non-ablative ultra-high temperature heat-resistant material, which can be used for re-entry aircraft, atmospheric The nose cone, leading edge, and key hot-end components of the engine combustion chamb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/645
CPCC04B35/806C04B35/58078C04B35/645C04B2235/3826C04B2235/5248C04B2235/5445
Inventor 胡平桂凯旋张幸红方成徐建国
Owner HARBIN INST OF TECH
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