Roller for continuous induction type quick quenching furnace and manufacturing method thereof

Abstract

The invention relates to a roller for a continuous induction type quick quenching furnace and a manufacturing method thereof, belonging to the field of refractory metal powder metallurgy and deformation processing. The roller is made of pure molybdenum or REO-doped molybdenum alloy, with an outer diameter of 400-800mm, a wall thickness of 15-60mm, a relative density of not less than 99.5%, and a tensile strength of not less than 500MPa. The manufacturing method uses molybdenum and molybdenum alloy powders that are uniformly doped with rare earth oxides in a liquid-liquid or solid-liquid method as raw materials, presses ring blanks by cold isostatic pressing, sinters at high temperature with hydrogen, and roughs them. , ring forging or closed die forging, then hydrogen annealed, and finally precision machining. The roller of the invention has uniform composition, high density, good strength and toughness, and excellent thermal fatigue resistance. It is an important part of a large-scale continuous induction quick quenching furnace of core equipment for the production of rare earth bonded magnetic powder, and can be extended to be applied to iron bases. Development and production of soft magnetic amorphous alloys, thermoelectric materials, etc.

Description

technical field [0001] The invention belongs to the field of refractory metal powder metallurgy and deformation processing, and particularly 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 a 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 magnetic powder, a key raw material, is a large-scale continuous induction quick quenching furnace, in which the chilled rollers of the critical parts determine the performance of the product and affect the continuous production capacity of the equipment. Generally speaking, thermal conductivity, that is, the product of thermal diffusivity and density and specific heat capacity (κρCp), is often used to measure ...

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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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