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A kind of reaction chemical vapor deposition preparation method of zrb2 ceramics

A chemical vapor deposition and reaction technology, which is applied in the direction of boron/boride, metal boride, etc., can solve the problems of poor bonding ability between the coating and the substrate, complicated preparation process, long reaction cycle, etc., to overcome the weakness of the poor bonding ability of the substrate , small and uniform grains, and the effect of improving high temperature ablation resistance

Inactive Publication Date: 2019-08-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a ZrB 2 The reactive chemical vapor deposition preparation method of ceramics overcomes the existing preparation of ZrB 2 In the coating technology, the controllability of the preparation process is poor, the bonding ability between the coating and the substrate is poor, the reaction cycle is long, and the preparation process is complicated.

Method used

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  • A kind of reaction chemical vapor deposition preparation method of zrb2 ceramics
  • A kind of reaction chemical vapor deposition preparation method of zrb2 ceramics
  • A kind of reaction chemical vapor deposition preparation method of zrb2 ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of ZrB by using carbon fiber woven cloth and C / SiC composite material prefabricated body 2 coating

[0027] Concrete preparation steps are as follows:

[0028]1. Preparation of prefabricated body: Cut the carbon fiber woven cloth into 4cm×4cm; put the two-dimensional laminated or three-dimensional needle-punched C / SiC composite prefabricated body with an open porosity of 20% to 40% in an ultrasonic cleaner with alcohol Wash for 1 hour, and dry in an oven at 100° C. for 2 hours to obtain a C / SiC preform.

[0029] 2. Slurry preparation: Mix the mass fractions of 30% Zr powder, 60% solvent, 2% dispersant, 3% binder, 3% plasticizer and 2% defoamer, and then ball mill for 24-36 hours get slurry;

[0030] 3. Slurry coating: evenly coat the slurry mixed by the ball mill on the surface of the preform;

[0031] 4. Vacuum drying: put the prefabricated body coated with slurry into a vacuum drying oven, and dry at 40°C for 12 hours;

[0032] 5. Reactive ...

Embodiment 2

[0033] Example 2: Preparation of ZrB by using carbon fiber woven cloth and C / SiC composite material prefabricated body 2 coating

[0034] Concrete preparation steps are as follows:

[0035] 1. Preparation of prefabricated body: Cut the carbon fiber woven cloth into 4cm×4cm; put the two-dimensional laminated or three-dimensional needle-punched C / SiC composite prefabricated body with an open porosity of 20% to 40% in an ultrasonic cleaner with alcohol Wash for 1 hour, and dry in an oven at 100° C. for 2 sales to obtain a C / SiC preform.

[0036] 2. Slurry preparation: Mix the volume fractions of 40% Zr powder, 50% solvent, 2% dispersant, 3% binder, 3% plasticizer and 2% defoamer, and then ball mill for 24-36 hours get slurry;

[0037] 3. Slurry coating: evenly coat the slurry mixed by the ball mill on the surface of the preform;

[0038] 4. Vacuum drying: put the prefabricated body coated with slurry into a vacuum drying oven, and dry at 40°C for 12 hours;

[0039] 5. Reacti...

Embodiment 3

[0041] Example 3: Preparation of ZrB by using carbon fiber woven cloth and C / SiC composite material prefabricated body 2 coating

[0042] Concrete preparation steps are as follows:

[0043] 1. Preparation of prefabricated body: Cut the carbon fiber woven cloth into 4cm×4cm; put the two-dimensional laminated or three-dimensional needle-punched C / SiC composite prefabricated body with an open porosity of 20% to 40% in an ultrasonic cleaner with alcohol Wash for 1 hour, and dry in an oven at 100° C. for 2 sales to obtain a C / SiC preform.

[0044] 2. Slurry preparation: mix 50% Zr powder, 60% solvent, 2% dispersant, 3% binder, 3% plasticizer and 2% defoamer by volume, and then ball mill for 24-36 hours get slurry;

[0045] 3. Slurry coating: evenly coat the slurry mixed by the ball mill on the surface of the preform;

[0046] 4. Vacuum drying: put the prefabricated body coated with slurry into a vacuum drying oven, and dry at 40°C for 12 hours;

[0047] 5. Reactive chemical va...

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Abstract

The invention relates to a reaction chemical vapor deposition preparation method of ZrB2 ceramics. The method includes: using a ball mill to evenly mix Zr powder with solvent alcohol, a dispersing agent, binder, plasticizer and a defoaming agent according to the proportion to prepare slurry, evenly coating the surface of preform with the slurry, and wing the coated preform to have in-suit reaction with BCl3, H2 and Ar in a chemical vapor deposition furnace under high temperature to generate ZrB2 coating. The method has the advantages that the problem that coating reaction raw materials are hard to control in an existing ZrB2 preparation process is solved effectively by controlling the thickness of the coating slurry, and the thickness of the ZrB2 coating can be controlled; the slurry and the BCl3 have the in-suit reaction under the reduction action of the H2 to generate the compact and continuous ZrB2 coating with fine and uniform crystalline grains, and the defect that the combining capacity of the ZrB2 coating prepared by the existing preparation process with a matrix is poor is overcome; the method is applicable to the coating modification of continuous fiber reinforced ceramic-based composite materials, and the high-temperature ablation resistance of the materials is increased.

Description

technical field [0001] The invention belongs to a preparation method of an ultra-high temperature ceramic coating, and relates to a ZrB 2 The preparation method of reactive chemical vapor deposition of ceramics is mainly applied to the coating modification of the anti-ablation performance of continuous fiber-reinforced ceramic matrix composite materials. Background technique [0002] Transition metal borides and carbides such as HfB 2 , ZrB 2 , HfC, ZrC and TaC have an ultra-high melting point exceeding 3000°C, and are called ultra-high temperature ceramics. Ultra-high temperature ceramics have the characteristics of high melting point, high strength, high hardness and excellent thermal shock resistance, and have great application potential in the aerospace field. where ZrB 2 In addition to the above properties, it also has low density, high thermal conductivity, moderate thermal expansion coefficient and good anti-oxidation and ablation performance, which can be used fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B41/455C04B35/806C04B35/565
Inventor 成来飞刘永胜朱艳张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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