Roller for continuous induction type rapid quenching furnace and manufacturing method of roller

Abstract

The invention relates to a roller for a continuous induction type rapid quenching furnace and a manufacturing method of the roller, and belongs to the field of refractory metal powder metallurgy and deformation machining. The roller is made of pure molybdenum or REO doped molybdenum alloy materials, the outer diameter is 400-800 mm, the wall thickness is 15-60 mm, the relative density is not lower than 99.5%, and the tensile strength is not lower than 500 MPa. The manufacturing method comprises the following steps: by taking molybdenum and molybdenum alloy powder which are highly purified by a wet method or are uniformly doped with rare earth oxide by a liquid-liquid or solid-liquid method as raw materials, performing cold isostatic pressing to obtain a ring blank, performing hydrogen high-temperature sintering, performing rough turning, performing ring forging or closed die forging, performing hydrogen annealing treatment, and finally performing precision machining. The roller is uniform in component, high in density, good in strength and toughness and excellent in thermal fatigue resistance, serves as an important component of a large continuous induction type rapid quenching furnace as core equipment for rare earth bonded magnetic powder production, and can be extensively applied to development and production of iron-based soft magnetic amorphous alloy, thermoelectric materials and the like.

Description

technical field [0001] The invention belongs to the field of refractory metal powder metallurgy and deformation processing, and in particular relates to a roller for a continuous induction type quick quenching furnace and a manufacturing method thereof. Background technique [0002] In recent years, mechanical and electronic products have shown the development trend of miniaturization, thinning, light weight, high frequency, low loss, and low noise, which has led to a rapid increase in the amount of high-performance bonded magnets. The core equipment for the production of key raw material magnetic powder is a large continuous induction quenching furnace, in which the chilled roller of the critical part determines the product performance and affects the continuous production capacity of the equipment. Generally speaking, thermal conductivity, that is, the product of thermal diffusivity, density and specific heat capacity (κρCp), is often used to measure the quality of the chi...

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Problems solved by technology

However, the above patents only mention the application of molybdenum rollers in the preparation of rapid quenching alloys, etc., and do not involve the chemical composition, size specifications, physical properties and preparation methods of molybdenum rollers

Youyan Rare Earth New Materials Co., Ltd. invented a thermal fatigue-resistant chilled roll material and its preparation method (ZL 201410432981.7), which mentioned that when the rare earth permanent magnet material is prepared by the rapid quenching method, the cooling roll always has the problem of thermal fatigue and fatigue The short life cannot meet the industrialization situation, and at the same time, a scheme to extend the working cycle by coating the surface of the metal cooling roller is proposed; Youyan Rare Earth also discloses the anti-thermal fatigue chilled roller material and its preparation method (CN 107988501 A), its in MoO 2 The powder is doped with rare earth element oxides to form an alloy, and then the molybdenum alloy roller is prepared by mixing, reducing, pressing, sintering, and thermal deformation. There are still problems to be improved. In addition, there is still a lack of clarity and constraints on the physical properties of molybdenum and molybdenum alloy rollers

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