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Preparation method of high-strength ultralow-expansion invar-based composite material

An invar alloy and composite material technology is applied in the field of preparation of invar alloy-based composite materials, which can solve the problems of complicated deformation processing technology for strengthening invar alloy, difficult to process large-sized components, etc., and achieves low cost, simple production process, Composition and process control for simple effects

Inactive Publication Date: 2011-05-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention aims to solve the technical problems of complex deformation processing technology and difficulty in processing large-size components in existing reinforced Invar alloys; and to provide a preparation method for high-strength and ultra-low expansion Invar alloy-based composite materials

Method used

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  • Preparation method of high-strength ultralow-expansion invar-based composite material
  • Preparation method of high-strength ultralow-expansion invar-based composite material
  • Preparation method of high-strength ultralow-expansion invar-based composite material

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specific Embodiment approach 1

[0019]Embodiment 1: The preparation method of the high-strength ultra-low expansion Invar alloy-based composite material in this embodiment is carried out according to the following steps: 1. High-purity titanium powder (mass purity ≥ 99.5%) and mass purity greater than 99% The carbon powder is put into the powder mixer according to the atomic percentage of 50:50 and mixed evenly, and then pressed into a prefabricated block; 2. At a temperature of 1500-1550°C and a vacuum of 0.5×10 -2 ~6×10 -2 Vacuum arc melting Invar alloy under the condition of Pa to obtain a melt; 3. Add the prefabricated block prepared in step 1 to the melt in step 2 according to the mass ratio of prefabricated block and Invar alloy in a ratio of 0.01 to 0.5:1, and then Keep it warm at ~1550°C for 5-40 minutes, then cool it down to 1400-1460°C, and then pour it into ingots or castings; 4. Heat treat the ingots or castings obtained in step 4 at 600-800°C, and heat treatment time is 0.5 ~10h; that is, a hig...

specific Embodiment approach 2

[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the temperature in step two is 1530°C and the degree of vacuum is 2×10 -2 ~3×10 -2 Pa vacuum arc melting Invar alloy. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the mass ratio of the prefabricated block to the Invar alloy in Step 3 is 0.05:1. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a preparation method of an invar-based composite material, in particular to a preparation method of a high-strength ultralow-expansion invar-based composite material. The invention aims to solve the technical problems that the deformation machining technique for the high-strength invar is complex and the high-strength invar is difficult to be machined into large-size components. The method comprises the following steps: 1. preparing high-purity titanium powder and carbon powder precast blocks; 2. smelting invar to obtain molten mass; 3. adding the precast blocks into the molten mass in step 2, and casting to obtain cast ingots or castings while keeping the temperature constant; and 4. carrying out heat treatment to obtain the high-strength ultralow-expansion invar-based composite material. Compared with the prior art, the high-strength ultralow-expansion invar-based composite material in the invention has the advantage of simple control on composition and technique and low cost, can be directly formed by casting without complex deformation hardening technique, does not contain precious metals, and particularly can control the coefficient of expansion of the invar at low level while greatly enhancing the strength of the low-expansion invar.

Description

technical field [0001] The invention relates to a preparation method of an Invar alloy-based composite material. Background technique [0002] Fe-Ni low-expansion Invar alloy is an alloy system with the smallest expansion coefficient among metal materials known so far. Under normal circumstances, the average thermal expansion coefficient α between room temperature and 200°C 200 <2×10 -6 / °C. Since Invar alloy has the characteristic that its size basically does not change with temperature, it has a wide range of applications in components that require close to constant dimensions at a certain ambient temperature, mainly including: (1) components in precision instruments; (2) Satellites, lasers, ring laser gyroscopes, etc.; (3) Various resonators, waveguides for microwave communications, standard frequency generators, etc.; (4) Shadow masks in high-resolution cathode ray tubes (picture tubes), etc.; (5) Components for the aerospace industry, etc. However, the hardness a...

Claims

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Application Information

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IPC IPC(8): C22C38/08
Inventor 骆良顺苏彦庆张宇民于红娇郭景杰傅恒志
Owner HARBIN INST OF TECH
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