Preparation method of in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramic with high damage tolerance

A damage-tolerant and isotropic technology, applied in the direction of inorganic raw material artificial filament, can solve the problem of poor damage tolerance, and achieve the effect of improving damage tolerance, breaking work, and critical crack size.

Active Publication Date: 2019-02-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention in order to solve the existing ZrB arranged along the uniaxial 2 In-plane anisotropy and multicomponent ZrB in fiber-based monolithic ceramics 2 The problem of poor damage tolerance of base ceramics provides a method for preparing high damage tolerance in-plane isotropic zirconium boride based ultra-high temperature monolithic ceramics

Method used

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  • Preparation method of in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramic with high damage tolerance
  • Preparation method of in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramic with high damage tolerance
  • Preparation method of in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramic with high damage tolerance

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specific Embodiment approach 1

[0031] Specific Embodiment 1: In this embodiment, the method for preparing in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramics with high damage tolerance is carried out according to the following steps:

[0032] 1. Dissolving polyethersulfone in N-methylpyrrolidone to obtain solution A;

[0033] The mass ratio of polyethersulfone to N-methylpyrrolidone is 1: (9-11);

[0034] 2. Weighing ZrB 2 Powder and SiC powder, ZrB to be weighed 2 The powder, SiC powder and solution A are placed in a ball mill for ball milling and mixing to obtain ZrB 2 - SiC paste;

[0035] The ZrB 2 The volume ratio of the total volume of the powder and SiC powder to the solution A is (0.8-1.2): 3;

[0036] The ZrB 2 The volume ratio of powder and SiC powder is (75~85):20;

[0037] Three, the ZrB 2 -SiC slurry is transferred to the syringe of the syringe pump, and the syringe pump is started to transfer the ZrB 2 - SiC slurry extruded into water bath to g...

specific Embodiment approach 2

[0048] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in the process of dissolving polyethersulfone in step 1 in N-methylpyrrolidone, mechanical stirring is used, the stirring speed is 90-110r / min, and the stirring time is 43-53h . Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the purity of polyethersulfone in step 1 is ≥98%; the purity of N-methylpyrrolidone is 99wt.%. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a preparation method of a zirconium boride-based ultra-high temperature monolithic material, in particular to a preparation method of an in-plane isotropic zirconium boride-based ultra-high temperature monolithic structure ceramic with high damage tolerance, and aims to solve the problems that ZrB2-based ultra-high temperature ceramic has poor damage tolerance and seriousin-plane anisotropy exists in ZrB2-based fiber monolithic ceramic. The preparation method includes: dissolving polyether sulfone in N-methylpyrrolidone, and conducting ball milling mixing with ZrB2 powder and SiC powder to obtain a ZrB2-SiC slurry, and subjecting the ZrB2-SiC slurry to extrusion curing to obtain continuous ZrB2-SiC ceramic fiber; dispersing ZrB2 powder, SiC powder and Graphene indeionized water to obtain a ZrB2-SiC-Graphene slurry; coating the continuous ZrB2-SiC ceramic fiber with the ZrB2-SiC-Graphene slurry, performing drying, and conducting prepressing, high temperature glue discharge and hot pressing sintering. The method provided by the invention solves the in-plane anisotropy problem of uniaxially arranged ZrB2-based fiber monolithic ceramic, and improves the damage tolerance. The method provided by the invention is suitable for preparation of zirconium boride-based ultra-high temperature monolithic structure ceramic.

Description

technical field [0001] The invention relates to a preparation method of zirconium boride-based ultra-high temperature monolithic ceramics. Background technique [0002] Zirconium boride (ZrB 2 ) Ceramics have high melting point (>3200℃), high thermal conductivity (>50W·m -1 ·K -1 ) and high conductivity (6.7×10 6 S / m), zirconium boride has great potential application value in thermal protection systems such as hypersonic aircraft leading edge and nose cone, rocket engine nozzle and combustion chamber lining. Adding SiC can improve ZrB 2 Mechanical properties and oxidation resistance of ceramics. However, ZrB 2 -The inherent brittleness of SiC ceramics limits their engineering applications in extreme environments, which requires the development of novel ZrB with high damage tolerance 2 -SiC ultra-high temperature ceramic material. [0003] The introduced fibers are toughened ZrB 2 -One of the effective ways of SiC ceramics, but due to the high sintering tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622D01F9/08C04B35/645
CPCC04B35/806C04B35/58078C04B35/622C04B35/62277C04B35/645C04B2235/5244C04B2235/5248C04B2235/96D01F9/08
Inventor 韩文波程业红张幸红胡平周善宝洪长青
Owner HARBIN INST OF TECH
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