A centrifugal sintering method of functionally graded material for thin-walled pipe fittings

A technology of functionally graded materials and sintering methods, which is applied in the field of powder metallurgy and composite materials, can solve problems such as large energy consumption, uneven interface and distribution, and non-smooth distribution of materials, and achieve a wide range of applications

Active Publication Date: 2020-12-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The material preparation method mainly adopts the high temperature method, which consumes a lot of energy;
[0005] (2) The size of the prepared material is small, and it is not easy to prepare samples with complex shapes;
[0006] (3) There are more or less interface and distribution inhomogeneities in the material. Due to the limitation of the preparation method, there is a step gradient, and the material distribution cannot be smoothly distributed. During the process of thermal shock or thermal cycle, there is still a large stress in the material

Method used

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  • A centrifugal sintering method of functionally graded material for thin-walled pipe fittings
  • A centrifugal sintering method of functionally graded material for thin-walled pipe fittings
  • A centrifugal sintering method of functionally graded material for thin-walled pipe fittings

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Effect test

Embodiment 1

[0035] TiB with a three-layer gradient 2 -Ti slurry as an example, namely (25%Ti-75TiB 2 / 50%Ti-50%TiB 2 / 75%Ti-25%TiB 2 ).

[0036] This embodiment provides a method for centrifugal sintering of functionally graded materials for thin-walled pipes, including the following steps:

[0037] 1) Convert TiB 2 Ceramic powder and Ti metal powder are mixed according to a predetermined ratio to achieve uniform distribution;

[0038] 2) The uniformly distributed TiB 2 Ceramic powder, Ti metal powder are mixed with solvent and dispersant, stirred in the air and degassed by vacuum to form a uniform slurry;

[0039] 3) Put the slurry into the spraying machine, then extend the nozzle into the substrate in the centrifuge, adjust the pressure of the spraying machine, and move the position of the nozzle from top to bottom and bottom to top, so that The slurry can be evenly sprayed on the inner wall of the substrate, and then moved out of the nozzle;

[0040] 4) Change TiB 2 The relat...

Embodiment 2

[0046] Take the three-layer gradient C-SiC slurry as an example (20%C-80%SiC / 40%C-60%SiC / 60%C-40%SiC).

[0047] This embodiment provides a method for centrifugal sintering of functionally graded materials for thin-walled pipes, including the following steps:

[0048] 1) Mix SiC powder and C powder according to a predetermined ratio to achieve uniform distribution;

[0049] 2) Mix the evenly distributed SiC powder and C powder with solvent and dispersant, stir in the air, and form a uniform slurry after vacuum degassing;

[0050] 3) Put the slurry into the spraying machine, then extend the nozzle into the substrate in the centrifuge, adjust the pressure of the spraying machine, and move the position of the nozzle from top to bottom and bottom to top, so that The slurry can be evenly sprayed on the inner wall of the substrate, and then moved out of the nozzle;

[0051] 4) changing the relative volume percentage of SiC powder and C powder, re-preparing the slurry, and spraying ...

Embodiment 3

[0057] Take the three-layer gradient Mo-ZrC slurry (25%Mo-75%SiC / 50%Mo-50%ZrC / 75%Mo-ZrC) as an example.

[0058] This embodiment provides a method for centrifugal sintering of functionally graded materials for thin-walled pipes, including the following steps:

[0059] 1) Mix ZrC powder and Mo powder according to a predetermined ratio to achieve uniform distribution;

[0060] 2) Mix evenly distributed ZrC powder, Mo powder with solvent and dispersant, stir in the air and form a uniform slurry after vacuum degassing;

[0061] 3) Put the slurry into the spraying machine, then extend the nozzle into the substrate in the centrifuge, adjust the pressure of the spraying machine, and move the position of the nozzle from top to bottom and bottom to top, so that The slurry can be evenly sprayed on the inner wall of the substrate, and then moved out of the nozzle;

[0062] 4) Change the relative volume percentage of the ZrC powder and the Mo powder, re-prepare the slurry, and spray the...

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Abstract

The invention discloses a centrifugal sintering method for a functionally graded material of a thin-wall pipe fitting. The centrifugal sintering method for the functionally graded material of the thin-wall pipe fitting comprises the following steps of mixing two evenly distributed powder, a solvent and a dispersing agent, stirring in air, and vacuum degassing to form an even slurry; loading the slurry into a pulp spraying machine, then stretching a spraying head into a base plate in a centrifugal machine, and evenly spraying the slurry onto the inner wall of the base plate; changing the relative volume percentage of the two powder, and forming a second layer of composite material layer; repeating the steps, and forming multilayer spraying; stretching a graphite radiation heating element into an inner cavity of the base plate, electrifying, moving up and down, installing a layer of heat insulation layer on the outer wall of the base plate, and electrifying the heat insulation layer; andturning off the centrifugal machine, sintering a green body, taking the green body out from the base plate, and obtaining a hollow pipe fitting. According to the centrifugal sintering method for thefunctionally graded material of the thin-wall pipe fitting provided by the invention, through adding the graphite radiation heating element, and installing the heat insulation layer on the outer layerof the base plate, the even temperature gradient is realized internally, so that an effective guarantee is provided for preparing the uniform and compact thin-wall pipe fitting.

Description

technical field [0001] The invention relates to centrifugal sintering of gradient composite materials, which belongs to the field of powder metallurgy and composite materials, in particular to a centrifugal sintering method of functionally gradient materials for thin-walled pipe fittings. Background technique [0002] Gradient functional material is a new type of functional composite material. Its two sides are composed of materials with different properties, and the composition and structure of the middle part change continuously in a gradient, so that the properties and functions of the material also change in a gradient along the thickness direction. The performance mismatch factor of combining different materials is overcome, so that the advantages of the two materials can be fully utilized. [0003] The main problems of present preparation method: [0004] (1) The material preparation method mainly adopts the high temperature method, which consumes a lot of energy; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F5/10B22F7/02C04B35/52C04B35/565C04B35/64
CPCB22F3/22B22F5/106B22F7/02B22F2202/17B22F2207/03C04B35/52C04B35/565C04B35/64C04B2235/666C04B2235/786
Inventor 张金咏王绍旺雷丽文张帆傅正义王为民
Owner WUHAN UNIV OF TECH
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