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Technological method for powder metallurgy rolling of molybdenum sheet

A process method and element technology, which is applied in the field of producing molybdenum element pieces by a method of powder metallurgy rolling, can solve the problems of fragility, low raw material utilization rate, and low strength of molybdenum element pieces, and achieve regular shape Effect

Inactive Publication Date: 2019-06-21
绍兴市荣士达衬布有限公司
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Problems solved by technology

[0003] At present, there are two processes for producing molybdenum element sheets: one is punching molybdenum slabs after rolling. Polishing → turning outer circle → chemical treatment → finished product This process has a low yield rate, only 50% of the total input amount, and the utilization rate of raw materials is low
[0004] The second process is to use molybdenum powder to directly press into molybdenum unit single piece, which is sintered and then forged. The process flow is as follows: molybdenum powder → batching → pressing monolithic blank → sintering → forging → turning outer circle → polishing → Chemical treatment → finished product This process produces molybdenum element sheet with a high yield, up to 65%, but the strength of molybdenum element sheet is low, easy to break, and it is difficult to meet the performance requirements of the material

Method used

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Embodiment Construction

[0010] Using four simultaneous rolling methods to produce molybdenum element sheets with a diameter of 76.2×2.5mm: Carry out batches of molybdenum powders, and then weigh 700g of molybdenum powders after the batches (each single sheet weighs 175g) and put them into the combined mold. Pressed with a hydraulic press, the pressing force is 140mp / cm 2 , the specification after sintering is 60×10mm in diameter. When sintering, use hydrogen to protect the intermediate frequency sintering furnace for sintering. The sintering temperature is 1950°C. The specification after sintering is 52×8.5mm in diameter. The production process is hot rolling. First, the sintered blank is heated to 1100°C in a hydrogen-passing heating furnace, kept for 1.5 hours, and rolled after it is released from the furnace. A total of four rolling times, the first time the thickness is reduced by 2mm, and the second time is reversed. Rolling, thickness reduction 1.5mm, the third reversing rolling, thickness redu...

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Abstract

The invention relates to a technological method for powder metallurgy rolling of a molybdenum sheet. The technological method comprises the following steps of: preparing molybdenum powder, blending, pressing a molybdenum sheet blank, sintering, rolling, turning the excircle, polishing, carrying out chemical treatment, and obtaining the finished product. The rolling technology is adopted in production technology. The technological method has the characteristics of not only retaining the physical properties of the stamped molybdenum sheet, and but also overcoming the defect of the relatively poor physical properties of the forging technology, improves the strength of the molybdenum sheet, optimizes the performances of the molybdenum sheet, simplifies the existing technological process and increases the overall rate of the finished product to 70%.

Description

technical field [0001] The invention relates to a processing method for molybdenum element sheets, in particular to a process for preparing molybdenum element sheets by powder metallurgy and rolling. [0002] technical background [0003] At present, there are two processes for producing molybdenum element sheets: one is that molybdenum slabs are punched after rolling, and the process flow is as follows: Molybdenum powder→batching→compacting→sintering→rolling→punching→ Polishing → turning outer circle → chemical treatment → finished product This process has a low yield, only 50% of the total input, and the utilization rate of raw materials is low. [0004] The second process is to directly press molybdenum powder into molybdenum unit single piece, which is sintered and then forged. The process flow is as follows: molybdenum powder → batching → pressing monolithic blank → sintering → forging → turning outer circle → polishing → Chemical treatment → finished product This proce...

Claims

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Application Information

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IPC IPC(8): B22F3/18
Inventor 俞亮
Owner 绍兴市荣士达衬布有限公司
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