Novel TiAl-based porous material with Ti5Si3 particle reinforced mesh-shaped pore wall and preparation method thereof
A particle-reinforced, porous material technology, applied in the field of TiAl-based composite materials and its preparation, can solve problems such as hindering high-temperature applications and insufficient high-temperature strength, and achieve the effects of improving high-temperature oxidation resistance, high pore structure, and improving pore wall structure
Active Publication Date: 2021-01-05
HARBIN INST OF TECH
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At the same time, the insufficient high-temperature strength of TiAl hinders its high-temperature application
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specific Embodiment approach 1
[0040]Specific implementation mode one: a new type of Ti in this implementation mode 5 Si 3 The preparation method of the TiAl-based porous material with particle-reinforced reticular pore walls is carried out in the following steps:
[0041] 1. Preparation of Ti-Al composite body by pressureless impregnation: loosely pack spherical Ti powder in a crucible, then place Al-Si alloy block on the spherical Ti powder, put the crucible into a vacuum furnace, and under vacuum conditions, use Raise the temperature to 630°C at a heating rate of 25°C / min, and hold the temperature for 15 minutes to complete the impregnation of the Al-Si alloy into the spherical Ti powder preform to obtain a Ti-Al composite body; the loose porosity of the spherical Ti powder is 48.2% The mass ratio of the spherical Ti powder to the Al-Si alloy block is 67:33; the mass content of Si in the Al-Si alloy block is 6%;
[0042] 2. Preparation of through-holes at medium temperature and without pressure: Under ...
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Abstract
The invention relates to a novel TiAl-based porous material with a Ti5Si3 particle reinforced mesh-shaped pore wall and a preparation method thereof. The invention belongs to the field of TiAl-based composite materials and preparation thereof. The invention aims to solve the technical problems that the pore wall of a through hole of an existing TiAl porous material is too simple, and the corrosionresistance, the high-temperature oxidation resistance and a filtering effect need to be improved, so that the TiAl-based porous material provided by the invention can adapt to more harsh service conditions. The novel TiAl-based porous material with the Ti5Si3 particle reinforced mesh-shaped pore wall is prepared from spherical Ti powder and an Al-Si alloy through vacuum pressureless reaction infiltration and high-temperature heat treatment, mesh-shaped pores are formed in the pore wall of the obtained Ti5Si3 particle reinforced TiAl-based porous material, the pore diameter of each mesh-shapedpore ranges from 1 micrometer to 9 micrometers, the porosity is larger than or equal to 58.6 percent, and the aperture ratio is larger than or equal to 44.8 percent. According to the method providedby the invention, Ti5Si3 particles are introduced to reinforce the mesh-shaped pore wall, so that a pore wall structure of the porous material is stabilized, the corrosion resistance and the high-temperature oxidation resistance are improved, and the service life is prolonged. The preparation method provided by the invention is simple, feasible, efficient and low in cost.
Description
technical field [0001] The invention belongs to the field of TiAl-based composite materials and preparation thereof; specifically relates to a novel Ti 5 Si 3 Particle-reinforced TiAl-based porous material with reticulated pore walls and a preparation method thereof. Background technique [0002] Due to their unique properties, porous materials are widely used in seawater desalination, aerospace, environmental protection, pharmaceutical separation, catalysis, energy storage, and chemical industries. Metal porous materials have high strength and good thermal conductivity, excellent shock absorption capacity, especially good gas-liquid permeability, and have great development potential in various industrial fields, but due to their poor corrosion resistance and high temperature resistance Poor oxidation performance limits its application in filtration fields such as high-temperature gas-liquid separation. The intermetallic compound porous material, especially the TiAl porou...
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IPC IPC(8): C22C1/08C22C14/00B22F3/11B22F3/24
CPCB22F3/114B22F3/24B22F2003/248C22C14/00
Inventor 李爱滨张学习王桂松钱明芳赵飒宋佳汶屈伟耿林
Owner HARBIN INST OF TECH