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Ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as preparation method and application thereof

A technology for toughening silicon borocarbon zirconium carbonitride and ablation resistant fibers, which is applied in the field of its preparation and toughening silicon boron carbonitride zirconium zirconium ceramic matrix composite materials by ablation resistant fibers, can solve the problem of the decline of the mechanical properties of the matrix, the decline of material uniformity, Material density decline and other problems, to achieve the effect of improving ablation resistance and oxidation resistance, improving density and mechanical properties, and improving service range and life

Inactive Publication Date: 2018-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent brittleness of ceramic materials greatly limits the application of silicon-boron-carbon-nitride ceramics and other high-temperature ceramic materials. Under extreme service conditions such as external force, thermal shock, and ablation, crack initiation, phase transition, and Crystallization and thermal failure lead to catastrophic fracture of the material
[0004] In order to alleviate the essential brittleness of ceramic materials, reinforcements are introduced into the matrix of silicon boron carbon nitrogen ceramics to improve the toughness of the matrix. At present, the commonly used reinforcements of silicon boron carbon nitrogen ceramics include carbon fibers, silicon carbide fibers, silicon oxide whiskers, etc., but the above The reinforcement is directly introduced into the matrix, and the interface between the matrix and the reinforcement is prone to defects such as pores, which leads to a decrease in the density of the material, and the segregation and overlap between the reinforcements will lead to a decrease in the uniformity of the material, which in turn leads to a decrease in the mechanical properties of the matrix

Method used

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  • Ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as preparation method and application thereof
  • Ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as preparation method and application thereof
  • Ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as preparation method and application thereof

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preparation example Construction

[0044] The invention provides a preparation method of ablation-resistant fiber-toughened silicon-boron-carbon-nitrogen-zirconium ceramic matrix composite material, comprising the following steps:

[0045] Step S1, preparing silicon boron carbon nitrogen zirconium powder;

[0046] Step S2, performing surface modification treatment on the fibers to obtain modified fibers;

[0047] Step S3, mixing the modified fiber with the silicon boron carbon nitrogen zirconium powder to obtain a composite powder;

[0048] In step S4, the composite powder is hot-pressed and sintered to obtain the ablation-resistant fiber-toughened silicon-boron-carbon-zirconium-zirconium ceramic matrix composite material.

[0049] In the present invention, the silicon boron carbon nitrogen zirconium powder is firstly prepared. The preparation of the silicon boron carbon nitrogen zirconium powder needs to prepare the zirconium boride powder first, in the glove box filled with argon (purity is 99.99%), weigh the...

Embodiment 1

[0069] The fiber described in this embodiment is preferably the carbon fiber, and the basic parameters of the carbon fiber are: the model is T1000G, the tensile strength is 6370MPa, the modulus of elasticity is 294GPa, the elongation is 2.2%, and the density is 1.80g / cm 3 , with a diameter of 4 to 6 μm; the carbon fibers are preferably chopped carbon fibers, the chopped carbon fibers are cut short by mechanical means, the length of the chopped carbon fibers is 1 to 2 mm, and the long diameter of the chopped carbon fibers is The ratio is (20-40):1.

[0070] The preparation method of the ablation-resistant fiber-toughened silicon boron carbon nitrogen zirconium ceramic matrix composite material is as follows:

[0071] 1.1 In a glove box filled with argon (purity: 99.99%), weigh the zirconium powder and the boron powder according to a molar ratio of 1:2 and add them to the silicon nitride ball mill jar, and nitride the After the silicon ball milling tank was sealed, it was taken...

Embodiment 2

[0088] The preparation method of the ablation-resistant fiber-toughened silicon boron carbon nitrogen zirconium ceramic matrix composite material is as follows:

[0089] 2.1 In a glove box filled with argon (purity: 99.99%), weigh the zirconium powder and the boron powder according to a molar ratio of 1:2 and add them to the silicon nitride ball mill jar, After the silicon ball milling tank was sealed, it was taken out from the glove box, and the silicon nitride ball milling tank was installed on a planetary high-energy ball mill for ball milling for 20 hours, wherein the ball-to-material ratio was 20:1, the diameter of the ball was 10 mm, and the rotation speed of the main disc was 20 h. is 500r / min, and the rotation speed of the planetary disk is 700r / min, the silicon nitride ball mill jar is placed in the glove box, and the zirconium boride powder is obtained by taking it out;

[0090] 2.2 In a glove box filled with argon (purity: 99.99%), weigh the silicon powder, the grap...

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Abstract

The invention discloses an ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as a preparation method and an application thereof. The preparation method of the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite comprises the following steps: S1, preparing Si-B-C-N-Zr powder; S2, performing surface modification treatment on fiber to obtain modifiedfiber; S3, mixing the modified fiber with the Si-B-C-N-Zr powder to obtain composite powder; S4, performing hot pressing and sintering on the composite powder to prepare the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite. The prepared ablative-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite has good microstructure and higher fracture toughness, mechanical property and ablative resistance, used raw materials are widely sourced and low in price, the preparation process is simple and mature, the preparation period is short, all the steps can be realized with existing technologies and equipment, and the composite is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to an ablation-resistant fiber-reinforced silicon-boron-carbon-nitrogen-zirconium ceramic-based composite material, a preparation method and application thereof. Background technique [0002] With the rapid development of aerospace technology and the improvement of spacecraft flight Mach number, higher requirements are put forward for the structural strength, high temperature resistance and ablation resistance of aircraft front fairing, engine combustion inner wall and nozzle materials. The combustion chamber and nozzle wall materials currently used are usually tungsten alloy, molybdenum alloy and iridium-rhenium alloy. These high-temperature metal materials have a large specificity and poor oxidation resistance, so they need to rely on the protection of oxidation-resistant coatings. [0003] Silicon-boron-carbon-nitrogen ceramics are a new type of inorganic material, rich in cova...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/628C04B35/645C04B35/80
CPCC04B35/806C04B35/515C04B35/62868C04B35/62873C04B35/645C04B2235/3813C04B2235/386C04B2235/425C04B2235/428C04B2235/5228C04B2235/5248C04B2235/526C04B2235/5264C04B2235/658C04B2235/96
Inventor 杨治华贾德昌王高远朱启帅梁斌周玉
Owner HARBIN INST OF TECH
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