Forming method of iridium alloy sealing cladding

A forming method and sealing package technology, applied in the field of power supply and precious metal processing, and isotope heat source, can solve the problems of micro cracks and low yield of spinning parts, achieve control of pass deformation, high yield, and increase spinning temperature Effect

Active Publication Date: 2022-02-11
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The forming technology of the iridium alloy cladding mainly adopts stamping, which has the disadvantages of stress concentration at the corner of the bottom of the cladding to form wrinkles, and micro-cracks are prone to occur inside the spinning parts, resulting in a low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, a 30mm in diameter and a 15mm high iridium alloy sealed casing are made through the following steps:

[0021] Step (1) iridium alloy plate rolling

[0022] The iridium alloy ingot is taken, and the iridium alloy ingot is coated with molybdenum and stainless steel in turn, and hot rolled. This hot rolling process specifically comprises the following steps:

[0023] (1.1) The rolling temperature is 1300°C, the pass deformation is 30%, and the rolling is to a thickness of 9mm;

[0024] (1.2) The temperature is 1200°C, the pass deformation is 20%, and the rolling thickness is 4mm;

[0025] (1.3) The temperature is 1050°C, the deformation of each pass is 15%, and the thickness is about 2mm after rolling;

[0026] (1.4) corrode molybdenum and stainless steel;

[0027] (1.5) The temperature is 900°C, the pass deformation is 15%, and the rolling thickness is about 1.5mm;

[0028] (1.6) A 1.0 mm sheet is rolled on a precision cold rolling mill, and the d...

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Abstract

The invention discloses a forming method of an iridium alloy sealing cladding. The forming method comprises the following steps: (1) rolling an iridium alloy plate; (2) preparing an iridium alloy wafer; and (3) spinning forming of the iridium alloy cladding: forming by adopting a hot spinning mode, and carrying out precision machining after forming to obtain the iridium alloy sealing cladding. In the hot rolling process of the iridium alloy plate, the stainless steel plate is coated on the basis of the traditional molybdenum plate coating process, so that volatilization of the molybdenum plate can be inhibited, the heat preservation effect of the alloy blank is improved, generation and expansion of cracks on the surface of the plate blank are prevented, and the yield of the iridium alloy plate is improved. A hot spinning method is adopted for cladding forming, the spinning temperature is increased, and the pass deformation amount is controlled, so that the problem that microcracks are easily generated due to stress concentration at the corners of the bottom of the cladding in the stamping process is solved, and the finished product rate of iridium alloy cladding forming is increased. According to the method, the problem of low yield of iridium alloy plate and cladding forming is solved, and the development process of a 238Pu isotope heat source can be effectively promoted.

Description

technical field [0001] The invention belongs to the technical field of isotope heat source, power supply and precious metal processing, and in particular relates to a forming method of an iridium alloy sealed cladding. Background technique [0002] Iridium alloy has the characteristics of high melting point, high temperature oxidation resistance and excellent high temperature mechanical properties, and is currently the only one suitable for hundreds of watts 238 PUO 2 Cladding material for isotopic heat sources. However, iridium is prone to brittle fracture during processing. Polycrystalline iridium cracks along grain boundaries during plastic deformation, is sensitive to strain rate, works hardened block, and has a high brittle-ductile transition temperature, so it cannot be plastically processed at room temperature. In order to improve the processing plasticity of iridium alloys, high temperature rolling is often used to reduce the work hardening and deformation resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王宁韩军姜涛向清沛吴奉承刘毅张健康向永春
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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