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A kind of preparation method of tial base alloy honeycomb structure

A technology of honeycomb structure and base alloy, which is applied in the field of preparation of metal honeycomb structure, can solve the problems of high temperature deformation resistance of TiAl base alloy, difficulty in breaking through thin plate preparation technology, and a large number of welding seams in honeycomb walls, so as to improve mechanical properties and structural stability. performance, avoid casting defects, high production efficiency

Inactive Publication Date: 2017-08-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve defects such as a large number of shrinkage porosity in the honeycomb structure prepared at present, long process, high energy consumption, high cost, and a large number of welds in the honeycomb wall , the process stability is poor, and the current TiAl-based alloy has a large high-temperature deformation resistance, and the technical problem that the thin plate preparation technology is difficult to break through, and a method for preparing a TiAl-based alloy honeycomb structure is provided.

Method used

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  • A kind of preparation method of tial base alloy honeycomb structure
  • A kind of preparation method of tial base alloy honeycomb structure
  • A kind of preparation method of tial base alloy honeycomb structure

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specific Embodiment approach 1

[0017] Specific embodiment 1: This embodiment is a method for preparing a TiAl-based alloy honeycomb structure, which is specifically carried out in the following steps:

[0018] 1. Forging: EDM cut the TiAl-based alloy billet into a cylindrical bar, and place it in a vacuum multifunctional hot pressing furnace. The vacuum degree is 10 -3 Under the conditions of Pa and heating rate of 5℃ / min~15℃ / min, the temperature is increased from room temperature to 1150℃~1300℃, and the vacuum degree is 10 -3 The temperature is 1150℃~1300℃ for 10min~60min, and then the vacuum degree is 10 -3 Pa, temperature is 1150℃~1300℃ and strain rate is 10 -1 s -1 ~10 -4 s -1 Open billet forging to a total deformation of 30% to 80% under the conditions of, and then the vacuum degree is 10 -3 Under the condition of Pa, it is cooled to 950℃~1100℃ with the furnace, and the vacuum degree is 10 -3 Hold for 2h~6h under Pa and temperature of 950℃~1100℃, when the vacuum degree is 10 -3 Under the condition of Pa, the...

specific Embodiment approach 2

[0023] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ratio of height to diameter of the cylindrical bar described in step 1 is 1:0.67. Others are the same as the first embodiment.

specific Embodiment approach 3

[0024] Specific embodiment three: The difference between this embodiment and specific embodiment one is that the extrusion ratio in step two is 2:1. Others are the same as the first embodiment.

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Abstract

The invention provides a preparing method of a TiAl-based alloy honeycomb structure and relates to a preparing method of a metal honeycomb structure. The preparing method aims at solving the technical problems that currently-prepared honeycomb structures have the defects of a large amount of shrinkage porosity, the working procedure is long, energy consumption is high, cost is high, a large quantity of welding seams exist on honeycomb walls, the process stability is poor, the current TiAl-based alloy is large in high-temperature deformation resistance, and the sheet preparation technology cannot be broken through. The preparing method comprises the first step of forging, the second step of extruding, the third step of water cutting, the fourth step of drawing and the fifth step of brazing. By means of the method, cost is reduced, honeycomb units are obtained through high-temperature drawing, a large number of casting defects in the precise casting method and a large number of welding seams in the bending / welding technology are avoided, and the mechanical performance and the structural stability of the honeycomb units are improved; in addition, honeycomb cores are integrally formed, and thus the structure smoothness is improved. The preparing method is applied to preparing the TiAl-based alloy honeycomb structure.

Description

Technical field [0001] The invention relates to a method for preparing a metal honeycomb structure. Background technique [0002] TiAl-based alloy has the advantages of low density and high specific strength at high temperature. As a new type of lightweight and high-strength material, it has great application potential in the aerospace field. The honeycomb structure has the advantages of high strength, low density, sound insulation and heat insulation, and has been widely used in the aerospace field. TiAl-based alloy honeycomb structure is of great significance for improving the thrust-to-weight ratio of aircraft. The existing processes for preparing honeycomb structures mainly include precision casting and core plate bending / welding combined processes. The TiAl-based alloy honeycomb structure prepared by the precision casting method has a large number of defects such as shrinkage and porosity, which greatly reduces its performance; the core plate bending / welding combined proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P13/00
CPCB23P13/00B23P2700/01
Inventor 张凯锋史程程卢振蒋少松
Owner HARBIN INST OF TECH
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