Preparation method of composite component with periodic gradient gradual change structure

A technology of composite components and gradient structures, which is applied in the field of material manufacturing, can solve problems such as poor mechanical properties of components, uneven powder composition, complex processes, etc., and achieve the effects of improving overall performance, avoiding spraying breakpoints, and simplifying the process flow

Pending Publication Date: 2022-03-08
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For refractory metal-ceramic structural parts with simple shapes, they are usually prepared by powder metallurgy, which mainly includes refractory metal-ceramic composite powder homogenization, compression molding, sintering densification, mechanical processing and other processes, and its components have high density. , Excellent mechanical properties; however, when using the above method to prepare special-shaped parts (such as cylindrical, conical, Laval nozzle and other rotary shapes), it is difficult to perform compression molding. In addition, uniformly mixed refractory metal-ceramic components are in When applied to special-shaped parts, there are a large number of metal channels, it is difficult to achieve precise control of structural performance, and cannot meet the requirements of weaponry, aerospace and other fields
[0003] At present, some researchers at home and abroad are exploring the use of plasma spraying technology to prepare refractory metal-ceramic composite components, especially special-shaped parts. Although some preliminary results have been achieved, they still face the following three problems: (1) Plasma spraying preformed components There are many pores in the structure, and the mechanical properties of the components are poor; (2) The thermal expansion coefficients of cermets are greatly different and the compatibility is poor. As the thickness of the coating increases, the stress accumulation will easily lead to cracking of the coating, and it is difficult to obtain a large thick sprayed ceramic-metal composite components; (3) for metal-ceramic components with a laminated structure, the powder composition in the transition area is not uniform, causing the components to deviate from the preset value. meet needs

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  • Preparation method of composite component with periodic gradient gradual change structure
  • Preparation method of composite component with periodic gradient gradual change structure
  • Preparation method of composite component with periodic gradient gradual change structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing a composite member with a periodic gradient structure, characterized in that:

[0035] Include the following steps:

[0036] Step 1: According to the shape and size of the components to be prepared, design and process a graphite core mold 2 with clamping parts 1 at both ends; the graphite core mold 2 is made of graphite with excellent high temperature strength, chemical stability and mechanical processing characteristics Material.

[0037] Step 2: Fix the graphite core mold 2 on the rotary tooling (the rotary tooling adopts the conventional rotary tooling in this field), and use the plasma spraying process of two-way powder feeding to continuously spray multi-layer coating on the surface of the graphite core mold 2 processed in step 1 Structure 3, to obtain a sprayed preformed member with a thickness of 3 mm on one side; wherein, the ceramic layer 31 in a single cycle coating is YSZ with a thickness of 100 μm, and the ceramic-metal layer 32 is ma...

Embodiment 2

[0042] A method for preparing a composite member with a periodic gradient structure, characterized in that:

[0043] Include the following steps:

[0044] Step 1: According to the shape and size of the components to be prepared, design and process a graphite core mold 2 with clamping parts 1 at both ends; the graphite core mold 2 is made of graphite with excellent high temperature strength, chemical stability and mechanical processing characteristics Material.

[0045] Step 2: Fix the graphite core mold 2 on the rotary tooling (the rotary tooling adopts the conventional rotary tooling in this field), and use the plasma spraying process of two-way powder feeding to continuously spray multi-layer coating on the surface of the graphite core mold 2 processed in step 1 Structure 3, to obtain a sprayed preformed component with a thickness of 5 mm on one side; wherein, the ceramic layer 31 in a single cycle coating is La with a thickness of 150 μm 2 Zr 2 o 7 , the ceramic-metal l...

Embodiment 3

[0050] A method for preparing a composite member with a periodic gradient structure, characterized in that:

[0051] Include the following steps:

[0052] Step 1: According to the shape and size of the components to be prepared, design and process a graphite core mold 2 with clamping parts 1 at both ends; the graphite core mold 2 is made of graphite with excellent high temperature strength, chemical stability and mechanical processing characteristics Material.

[0053] Step 2: Fix the graphite core mold 2 on the rotary tooling (the rotary tooling adopts the conventional rotary tooling in this field), and use the plasma spraying process of two-way powder feeding to continuously spray multi-layer coating on the surface of the graphite core mold 2 processed in step 1 Structure 3, to obtain a sprayed preformed member with a thickness of 8 mm on one side; wherein, the ceramic layer 31 in a single cycle coating is Al with a thickness of 200 μm 2 o 3 , the ceramic-metal layer 32 i...

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Abstract

The invention provides a preparation method of a composite component with a periodic gradient gradual change structure, which comprises the following steps of: (1) designing and processing a graphite core mold with a clamping function, (2) spraying a multi-layer coating structure by adopting a double-path powder feeding plasma spraying process to obtain a spraying pre-forming component, and (3) preparing the composite component with the periodic gradient gradual change structure. (3) treating the spraying pre-forming component subjected to a hot isostatic pressing process to obtain a high-density composite component, and (4) removing the graphite core mold (2) by adopting machining to obtain a ceramic-metal composite component; the single-layer coating structure comprises at least two ceramic layers, at least two ceramic-metal layers and at least two metal layers, and the metal phase content of the ceramic-metal layers changes in a gradient mode. The method is suitable for forming the refractory metal-ceramic composite powder of the special-shaped part with the complex shape, the composite component with the periodic gradient gradual change structure can be obtained, the spraying efficiency is high, and the comprehensive performance of the refractory metal-ceramic composite component is excellent.

Description

technical field [0001] The invention relates to the technical field of material manufacturing, in particular to a method for preparing a composite component with a periodic gradient structure. Background technique [0002] Composite materials composed of refractory metals and ceramics not only have the high thermal stability, high wear resistance and corrosion resistance of ceramic materials, but also have the high melting point, high strength and high toughness of refractory metals, and have been widely used in weaponry, aerospace and other fields. a wide range of applications. For refractory metal-ceramic structural parts with simple shapes, they are usually prepared by powder metallurgy, which mainly includes refractory metal-ceramic composite powder homogenization, compression molding, sintering densification, mechanical processing and other processes, and its components have high density. , Excellent mechanical properties; however, when using the above method to prepar...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 吴护林李忠盛白懿心宋凯强丛大龙张敏何庆兵丁星星彭冬王旋杨昕睿
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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