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Method for connecting Cf/Al composite materials and TiAl through laser ignition self-propagating reaction auxiliary brazing

A composite material and laser ignition technology, which is applied in the direction of laser welding equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of deterioration of base material performance, interface bond damage, high heating temperature, etc., and achieve high connection efficiency, Good performance, the effect of improving density

Inactive Publication Date: 2014-02-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the C f Severe interfacial reaction between carbon fiber and aluminum matrix in /Al composite material, the interfacial bond is destroyed,

Method used

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  • Method for connecting Cf/Al composite materials and TiAl through laser ignition self-propagating reaction auxiliary brazing
  • Method for connecting Cf/Al composite materials and TiAl through laser ignition self-propagating reaction auxiliary brazing

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specific Embodiment approach 1

[0014] Specific Embodiment 1: In this embodiment, a laser ignited self-propagating reaction assisted brazing connection C f The method of / Al composite material and TiAl is specifically completed according to the following steps:

[0015] 1. Preparation of nickel powder / aluminum powder mixed powder: take 45 parts to 55 parts of nickel powder and 45 parts to 55 parts of aluminum powder in parts by weight and mix them evenly, then place them in a ball mill tank, and the mass ratio of balls to materials is (5 ~10): 1 ratio into the ball, under the condition of argon protection, ball milling at a speed of 300r / min~500r / min for 2h~3h, to obtain nickel powder / aluminum powder mixed powder;

[0016] 2. Preparation of the intermediate layer compact: the nickel powder / aluminum powder mixed powder obtained in step 1 is pressed into an intermediate laminate compact with a relative density of 60% to 80% and a thickness of 1 mm to 2 mm, and sealed for storage;

[0017] 3. Surface pretreatm...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that: the mesh number of the nickel powder in step 1 is ≥ 200 mesh. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the mesh number of the aluminum powder described in step 1 is ≥ 325 mesh. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for connecting Cf/Al composite materials and TiAl, in particular to a method for connecting Cf/Al composite materials and TiAl through laser ignition self-propagating reaction auxiliary brazing. The method aims to solve the problems that in a conventional welding method, due to the fact that heating temperature is too high and pressure is too large, carbon fibers and an aluminum substrate in the Cf/Al composite materials generate a serious interfacial reaction, interfacial combination is damaged, and the performance of base metal is weakened. The method comprises the steps that 1, nickel powder/aluminum powder mixed powder is prepared; 2, a middle-layer compact is prepared; 3, surface pretreatment is carried out; 4, laser ignition is carried out. The laser ignition is used for igniting the middle layer, complete reaction is carried out on the middle layer, and even products are formed. Brazing filler metal is heated and melted, the clearance of the middle layer is filled, and connector density is improved. The base metal on the two sides, the middle layer and the brazing filler metal form metallurgical bonding, a connector good in performance can be obtained, and the strength can reach more than 40.5Mpa. The method can be used for connecting the Cf/Al composite materials and the TiAl.

Description

technical field [0001] The present invention relates to a connection C f / Al composites with TiAl approach. Background technique [0002] Carbon fiber reinforced aluminum matrix composites (abbreviated as C f Al composite material) is composed of continuous carbon fiber and aluminum matrix, and is a new type of structural material with broad application prospects. C f The / Al composite material has the advantage of light weight of carbon fiber, and its density is lower than that of aluminum alloy, but its elastic modulus and tensile strength are 2 to 4 times that of ordinary aluminum alloy, so it has higher specific stiffness and specific strength. At the same time, due to the reinforcement of continuous carbon fibers, C f / Al composites have high axial tensile strength and wear resistance, low thermal expansion coefficient, good electrical and thermal conductivity and fatigue resistance, and can especially maintain good dimensional stability in humid and radiation envir...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/60
CPCB23K1/19B23K1/20B23K2103/10
Inventor 李卓然冯广杰申忠科刘羽
Owner HARBIN INST OF TECH
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