A kind of cu-ni-al-ce porous alloy and preparation method thereof

Abstract

The invention discloses a Cu-Ni-Al-Ce porous alloy and a preparation method thereof. The porous alloy comprises 25% to 35% of Ni, 10% to 15% of Al, 2% to 4% of Ce, the balance is Cu. The preparation method includes (1) heating Cu, Ni, Al, and Ce to a molten state to obtain Cu-Ni-Al-Ce alloy liquid; (2) atomizing the alloy liquid to obtain Cu-Ni-Al-Ce mist (3) sending the atomized powder into an atmosphere sintering furnace and reducing it with high-purity hydrogen; (4) hot pressing and sintering the reduced atomized powder to obtain a Cu-Ni-Al-Ce porous alloy. The Cu-Ni-Al-Ce porous alloy of the present invention has uniform chemical composition, high alloy purity, good high-temperature compression performance and high-temperature creep resistance under the condition of relatively high porosity, and the preparation method is simple in process and low in cost .

Description

technical field [0001] The invention relates to a porous alloy suitable for preparing molten carbonate fuel cell anode materials and a preparation method thereof, in particular to a Cu-Ni-Al-Ce porous alloy and a preparation method thereof. Background technique [0002] Molten Carbonate Fuel Cell (MoltenCarbonateFuelCell, MCFC) is a high-temperature fuel cell that uses a molten alkali metal carbonate mixture as the electrolyte and operates at a high temperature of 600-700 °C without the need for noble metals as catalysts. Molten carbonate fuel cells not only have the advantages of high power generation efficiency, no pollution, and high-temperature exhaust heat recovery and utilization, but also have the advantages of low cost, abundant fuel sources, high value of waste heat utilization, and relatively simple structure. Power generation, military special power supply, mobile power supply and other aspects have broad application prospects. [0003] The anode is an important ...

AI Technical Summary

Problems solved by technology

However, the porous Cu-Ni-Al alloy prepared from the existing three elements of Cu-Ni-Al still has obvious deficiencies in compression resistance, corrosion resistance and sintering resistance. For example, when Cu, Ni, When the Al mixed powder is sintered, Al will cause the sample to expand during the sintering process, especially when the Al content is high (wt.%≥5%), the high melting point alumina film covered on the surface of the Al powder will prevent the metal in the sintered powder Atomic contact makes sintering difficult to control; and the porous alloy sintered with Cu-Ni-Al atomized powder has low mechanical properties and creep properties of the sintered body, which is difficult to meet the performance requirements for anode materials in MCFC

In addition, the MCFC porous metal anode that has been working at a high temperature of 650°C for a long time will sinter and cause material migration, resulting in changes in the micropore structure and reduction of porosity, changing the stress distribution at the pore edges, affecting the creep characteristics of the anode, and causing the MCFC to fail. Performance drop

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