Rolling method of molybdenum plate for spinning large-length-diameter-ratio molybdenum crucible

A large aspect ratio, molybdenum crucible technology, applied in the direction of metal rolling, can solve the problems of unfavorable spinning deformation, poor ductility, etc.

Active Publication Date: 2019-06-18
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for rolling molybdenum plates for spinning molybdenum crucibles with large aspect ratios to at least solve the problems of poor ductility of molybdenum plates for spinning molybdenum crucibles with large aspect ratios, which is not conducive to spinning deformation, etc.

Method used

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  • Rolling method of molybdenum plate for spinning large-length-diameter-ratio molybdenum crucible
  • Rolling method of molybdenum plate for spinning large-length-diameter-ratio molybdenum crucible
  • Rolling method of molybdenum plate for spinning large-length-diameter-ratio molybdenum crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of a molybdenum plate for spinning with a thickness of 4.8 mm specifically includes the following steps:

[0045] S1, feeding materials, select a mold with a thickness of 60mm such as a rubber sleeve mold, and load molybdenum powder.

[0046] S2, molding, using cold isostatic pressing to mold the mold containing the powder selected in step S1; the pressure used for molding is 220 MPa, and the pressure is maintained for 20 minutes. After the pressing process, the pressed slab is shaped according to the shrinkage ratio in the sintering process, so as to ensure that the sintered slab is flat and intact.

[0047] S3, sintering, sintering the shaped slab in step S2; placing the shaped slab in an intermediate frequency furnace for sintering, heating the molybdenum slab to 600°C, keeping it warm for 1 hour, and then heating to 900°C, Keep warm for 2 hours, then heat to 1200°C, keep hold for 4 hours, then heat to 1300°C, keep hold for 2 hours, then heat to 1600...

Embodiment 2

[0054] The preparation of a molybdenum plate for spinning with a thickness of 2.5 mm specifically includes the following steps:

[0055] S1, feeding materials, select a mold with a thickness of 50mm such as a rubber sleeve mold, and load molybdenum powder.

[0056] S2, molding, using cold isostatic pressing to mold the mold containing the powder selected in step S1; the pressure used for molding is 200 MPa, and the pressure is maintained for 30 minutes. After the pressing process, the pressed slab is shaped according to the shrinkage ratio in the sintering process, so as to ensure that the sintered slab is flat and intact.

[0057] S3, sintering, heating the molybdenum slab to 700°C, holding it for 2 hours, then heating to 1000°C, holding it for 2 hours, then heating it to 1200°C, holding it for 2 hours, then heating it to 1400°C, holding it for 3 hours, then heating it to 1500°C, hold for 3 hours, then heat to 1800°C, hold for 2 hours, and finally heat to 2100°C, hold for 5 ...

Embodiment 3

[0064] In this embodiment, except that the sintering process is different from embodiment 1, other process steps are the same as embodiment 1. The sintering process of this example is to raise the temperature to 2000°C at a rate of 10°C / min, and keep it warm for 5 hours. The density of the obtained molybdenum slab is 9.6cm 3 / g.

[0065] The elongation at break in the longitudinal direction of the rolled piece obtained after rolling by the rolling process of Example 1 reaches 15%, and the elongation at break in the transverse direction of the rolled piece reaches 10%.

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Abstract

The invention provides a rolling method of a molybdenum plate for spinning a large-length-diameter-ratio molybdenum crucible. The method comprises firstly, a proper mold is selected according to the size of a required molybdenum slab to carry out powder loading, then compression molding is carried out on the mold containing the powder to prepare the slab, then sintering is carried out on the pressed slab, large-deformation rolling is carried out on the sintered slab by using a cross rolling method, so that the binding force between the internal tissues of the slab is improved, isotropic fine fiber tissues can be obtained through cross rolling, moreover, the longitudinal and transverse tissues are in staggered lap joint, so that the tissues are more uniform, the defects which are generateddue to the fact that the stress is not uniform in all directions can be effectively avoided, and favorable conditions are provided for follow-up spinnin. According to the rolling method, the molybdenum raw material slab is processed by adopting the cross rolling method of isostatic cool pressing, sintering and large deformation, so that the spinning requirement of the large-length-diameter-ratio molybdenum crucible is met, and important significance on the production of the large-length-diameter-ratio molybdenum crucible is achieved.

Description

technical field [0001] The invention belongs to the technical field of molybdenum crucible processing, and in particular relates to a rolling method of a molybdenum plate used for spinning a molybdenum crucible with a large aspect ratio. Background technique [0002] Sapphire crystal (α-Al 2 o 3 ) is a high-quality optical functional material with high temperature resistance, wear resistance, corrosion resistance and wide light transmission band, and it is also one of the most widely used oxide substrates (mainly used as semiconductor substrates and large-scale integrated circuit substrates) materials First, it can be used in microelectronics-optoelectronics technology, military, aerospace, communications, medicine and other fields, and has broad application prospects. [0003] At present, there are many methods to produce sapphire single crystal, such as Kyropoulos method, Chai's crystal pulling method, guided mode method, heat exchange method, temperature gradient method...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B3/00B21C37/02B22F3/16
Inventor 吴朝圣杨义兵钟铭吴孟海郭雪琪王广达
Owner 安泰天龙钨钼科技有限公司
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