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Novel platinum-based high-temperature resistance strain alloy and preparation method thereof

A resistance strain, high temperature technology, applied in the field of metal materials, can solve the problems of reduced resistivity and mechanical properties, inability to meet the requirements of strained materials, deterioration of alloy stability, etc., to reduce oxidation and volatilization, and improve organizational uniformity and stability. The effect of resistance and moderate tensile strength

Active Publication Date: 2018-06-19
SINO PLATINUM METALS CO LTD
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Problems solved by technology

[0006] When the temperature of the existing precious metal resistance strain alloys at home and abroad is higher than 1000 °C, the material will be oxidized and volatilized severely, the resistivity and mechanical properties will drop sharply, and the stability of the alloy will deteriorate, which cannot meet the requirements of the static resistance strain gauge above 1000 °C for strained materials. Require

Method used

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  • Novel platinum-based high-temperature resistance strain alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Each component of the alloy is formulated according to the ingredients of 15%Rh, 5%Mo, 4%Re, 0.5%Cr, 0.3%Ni, 0.1%Y, and the balance of Pt. It is melted in a high-purity zirconia crucible and a high-frequency induction furnace. When smelting, vacuumize the smelting chamber to 0.5×10 -3 Pa, filled with high-purity argon (99.999%, volume fraction) to positive pressure, the alloy should be fully degassed in the molten state to increase the density of the ingot, and the melt is overheated at 180°C and cast into a crystallization mold. The ingot is forged at 1200°C, drawn at 800°C, drawn at room temperature, intermediate annealed, drawn into filaments, and processed into ultra-fine wires with a diameter of Φ0.03mm. Stabilization treatment: heat preservation at 1200°C for 2 minutes, water quenching, 900 ℃ stabilization treatment for 30 hours, the performance is shown in Table 1.

Embodiment 2

[0020] Each component of the alloy is formulated according to the ingredients of 20%Rh, 7%Mo, 6%Re, 1.0%Cr, 0.5%Ni, 0.2%Zr, 0.2%Y, and the balance of Pt. High-purity zirconia crucible, high-frequency induction Furnace smelting, vacuumize the smelting chamber to 0.3×10 - 2 Pa, filled with high-purity argon (99.999%, volume fraction) to positive pressure, the alloy should be fully degassed in the molten state to increase the density of the ingot, and the melt is overheated at 200 ° C and cast into a crystallization mold. The ingot is forged at 1300°C, drawn at 900°C, drawn at room temperature, intermediate annealed, drawn into filaments, and processed into ultra-fine wires with a diameter of Φ0.03mm. Stabilization treatment: heat preservation at 1200°C for 2 minutes, water quenching, 1000 ℃ stabilization treatment for 30 hours, the performance is shown in Table 1.

Embodiment 3

[0022] Each component of the alloy is formulated according to the ingredients of 30% Rh, 9% Mo, 8% Re, 1.5% Cr, and the rest of Pt. It is melted in a high-purity zirconia crucible and a high-frequency induction furnace. When melting, the melting chamber is first evacuated. to 0.3×10 -2 Pa, filled with high-purity argon (99.999%, volume fraction) to positive pressure, the alloy should be fully degassed in the molten state to increase the density of the ingot, and the melt is overheated at 230 ° C and cast into a crystallization mold. The ingot is forged at 1350°C, drawn at 950°C, drawn at room temperature, intermediate annealed, drawn into filaments, and processed into ultra-fine wires with a diameter of Φ0.03mm. Stabilization treatment: 1200°C for 2 minutes, water quenching, 1000°C Stabilized for 30 hours, the properties are shown in Table 1.

[0023] Table 1 is the comparison of mechanical properties and electrical properties of PtRhMoReCr and PdCr13, PtW8, PtWReNiCr (Y) res...

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Abstract

The invention discloses novel platinum-based high-temperature resistance strain alloy and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 15 to 40 percent of Rh, 4 to 10 percent of Mo, 2 to 8 percent of Re, 0.5 to 3 percent of Cr, and the balance of Pt. The alloy can also be added with 0 to 2 percent of M (M is at least one of Ni, Zr, Y and Sc). A finish product is prepared by adopting the processes of preparing an alloy ingot in a high-frequency induction smelting furnace, hammer cogging at a high temperature, performing stableheat treatment and the like. The alloy material has high tensile strength and electrical resistivity, low resistance temperature coefficient, excellent high-temperature mechanical properties and oxidation resistance, and resistance-temperature characteristic is linear in the temperature range of 0 to 1,050 DEG C, the novel platinum-based high-temperature resistance strain alloy can be widely applied to the stress-strain test of a hot end component at over 1,000 DEG C in the fields, such as spaceflight, aviation, heavy machinery, petrochemical industry and nuclear industry, and ensures the safety and reliability of an operating system.

Description

technical field [0001] The invention relates to a novel platinum-rhodium-molybdenum-rhenium-chromium high-temperature resistance strain alloy and a preparation method thereof, belonging to the field of metal materials. technical background [0002] Using the relationship between metal deformation and its resistance change, the metal wire or foil is made into a resistance strain gauge according to a certain resistance value, and the non-electricity is converted into electricity to facilitate the measurement and control of the stress distribution. This is the engineering of the complex stress field. An important means of component stress. In aerospace, heavy machinery, petrochemical, and nuclear industries, strain gauges are widely used, especially for thermal stress components such as spacecraft, atomic reactors, space shuttles, high-speed rotating turbine engine blades, steering gear, and nozzles. The measurement of high temperature stress and strain requires the developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C22C1/02C22F1/14
Inventor 尹俊美万吉高刘毅武海军罗雁波程勇申丽琴李强
Owner SINO PLATINUM METALS CO LTD
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