Preparation method of thorium-containing iridium alloy

A technology of alloy and hydrogen, which is applied in the field of preparation of thorium-iridium alloys, can solve the problems of complex preparation process and difficulty in controlling the uniformity of trace elements, and achieve the effects of simplifying the preparation process, improving plasticity and reducing losses

Active Publication Date: 2022-02-18
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

Its preparation process is complicated, and it is difficult to control the uniformity of trace elements added in the smelting process

Method used

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Embodiment 1

[0022] The iridium alloy of this embodiment is composed of the following components by mass percentage: W3400ppm, Th68ppm, the balance being Ir and unavoidable impurities.

[0023] The preparation of the iridium alloy of the present embodiment may further comprise the steps:

[0024] Step (1), taking by weighing 35g of iridium powder with a purity of 99.95%, transferring to a mold and placing it in a cold isostatic press for pressing, the pressing force is 80MPa;

[0025] Step (2), transfer the pressed iridium block to a hydrogen furnace for pre-sintering, the working parameters are: sintering temperature 1000°C, sintering time 1h, sintering atmosphere is hydrogen:

[0026] The sintered iridium block is transferred to a vacuum high-temperature sintering furnace for sintering. The working parameters are: sintering temperature 1500°C, sintering time 4h, vacuum degree less than 1.0×10 -2 Pa.

[0027] In step (3), the iridium block is transferred to a vacuum arc melting furnace,...

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Abstract

The invention discloses a preparation method of thorium-containing iridium alloy, which comprises the following steps: (1) pressing high-purity iridium powder serving as a raw material on a cold isostatic press to obtain a pressed iridium block; (2) sequentially putting the iridium block into a hydrogen pre-sintering furnace and a vacuum high-temperature sintering furnace for sintering to obtain a sintered iridium block; (3) transferring the iridium block obtained by sintering into an electric arc melting furnace to be smelted with a tungsten-thorium alloy to obtain a thorium-containing iridium alloy; and (4) cleaning the iridium alloy ingot, transferring the iridium alloy ingot into an electron beam smelting furnace for smelting, and pouring to obtain the thorium-doped iridium tungsten alloy ingot. In the electric arc melting process, tungsten and thorium doping elements are simultaneously introduced through a tungsten and thorium electrode, the existing preparation process of the thorium-containing iridium alloy can be simplified, and meanwhile, the uniformity of the doping elements is guaranteed to the maximum extent. The thorium content in the iridium alloy can be regulated and controlled by adjusting the thorium content in the tungsten thorium electrode. And meanwhile, the prepared alloy has the characteristics of small grain size and excellent performance, and meets the requirements of a 238Pu isotope power supply on a cladding material.

Description

technical field [0001] The invention belongs to the technical field of isotope heat source, power supply and precious metal manufacturing, and specifically relates to a preparation method of a thorium-containing iridium alloy. Background technique [0002] The melting point of iridium is 2450°C, and the service temperature can reach 2200°C. It will not show obvious oxidation phenomenon in the atmosphere below 1000°C, and has good high-temperature durability and creep strength. Good mechanical properties, thus iridium is ideal 238 Pu isotope power cladding material. However, pure iridium has poor processing performance and is brittle at high temperature, which needs to be improved by adding other elements for alloying. America in 238 The main preparation process of the iridium alloy used in the Pu isotope power supply is: first add tungsten element to the iridium raw material and use electron beam melting to prepare the iridium-tungsten alloy, then add thorium and aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C5/04
CPCC22C1/02C22C5/04Y02E30/30
Inventor 王宁韩军向清沛姜涛吴奉承刘毅张健康向永春郝樊华
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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