Large-size high-density tungsten crucible and preparation method thereof

A tungsten crucible and high-density technology, which is applied in the field of large-scale high-density tungsten crucible and its preparation, can solve the problems of low crucible density, unsatisfactory development, high energy consumption, etc., and achieve low impurity content, batch production, and high density. Effect

Inactive Publication Date: 2013-10-16
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum outer diameter of the tungsten crucible produced by the ordinary powder metallurgy process is Moreover, the density of the crucible is low, and the energy consumption in the production process is high, which cannot meet the needs of development

Method used

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  • Large-size high-density tungsten crucible and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Select Fw-1 type tungsten powder with an average Fibonacci particle size of 1.8 microns as the raw material of the tungsten crucible, and batch together in a V-type mixer for 1 hour.

[0029] (2) According to Type tungsten crucible drawings (such as figure 1 shown) to design the crucible core.

[0030] (3) Assemble the mold core and rubber sleeve according to the required size of the green compact, put the raw materials into the sleeve, and seal it after the filling is completed. Hang the loaded mold core into the cold isostatic press cylinder and press it. The forming pressure is 220Mpa, the pressure is kept for 15 minutes, and the pressure release time is 5 minutes.

[0031] (4) The compact is sintered in a high-temperature sintering furnace, the heating rate is 80°C / h, the maximum temperature is 2200°C, and the high-temperature holding time is 6 hours.

[0032] (5) Check the appearance quality of the sintered billet without defects, and measure the sintered b...

Embodiment 2

[0035] (1) Select Fw-1 type tungsten powder with an average Fischer grain size of 4 microns as the raw material of the tungsten crucible, and batch it in a V-type mixer for 4 hours.

[0036] (2) According to Type tungsten crucible drawing design crucible core.

[0037] (3) Assemble the mold core rubber sleeve according to the required size of the green compact, put the raw materials into the sleeve, and seal it after the filling is completed. Hang the loaded mold core into the cold isostatic press cylinder and press it. The forming pressure is 270Mpa, the pressure is maintained for 50 minutes, and the pressure release time is 20 minutes.

[0038] (4) The compact is sintered in a high-temperature sintering furnace, the heating rate is 150°C / h, the maximum temperature is 2400°C, and the high-temperature holding time is 12 hours.

[0039] (5) Check the appearance quality of the sintered billet without defects, and measure the sintered billet density of the tungsten crucible wi...

Embodiment 3

[0042] (1) Select Fw-1 type tungsten powder with an average Fischer particle size of 3 microns as the raw material for the tungsten crucible, and batch together in a V-type mixer for 2 hours.

[0043] (2) According to Type tungsten crucible drawing design crucible core.

[0044] (3) Assemble the mold core and rubber sleeve according to the required size of the green compact, put the raw materials into the sleeve, and seal it after the filling is completed. Hang the loaded mold core into the cylinder of the cold isostatic press for pressing, and the forming pressure is 250Mpa. Hold the pressure for 30 minutes and release the pressure for 15 minutes.

[0045] (4) The compact is sintered in a high-temperature sintering furnace, the heating rate is 100°C / h, the maximum temperature is 2300°C, and the high-temperature holding time is 10 hours.

[0046] (5) Check the appearance quality of the sintered billet without defects, and measure the sintered billet density of the tungsten...

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Abstract

The invention provides a large-size high-density tungsten crucible which is mainly used for sapphire crystal growth industry, and particularly provides a preparation method for the large-size high-density tungsten crucible. The method comprises the following steps: raw materials processing, mould core manufacturing, mould setting and forming, high-temperature sintering and mechanical processing. Compared with the prior art, the produced crucible is large in size range and suitable for mass production. Moreover, no binding agent is added in the production process, and impurity content of the product is low; the finished product has the advantages of being high in density, large in size (maximal external diameter of phi 650 mm and maximal height of 800 mm), good in size adaptability and consistency, and high in yield and surface finish, can bear 2000-2300 DEG C high temperature under the protective atmosphere, and can not react with sapphire raw materials under the high temperature.

Description

technical field [0001] The invention belongs to the technical field of special processing of refractory metals, and in particular relates to a large-size high-density tungsten crucible and a preparation method thereof. Background technique [0002] Tungsten crucible is the core component of sapphire crystal growth furnace, which directly affects the quality of sapphire. With the development of the LED industry, large-sized sapphire crystals are needed to make chip substrate materials. Increasing the size of the crucible is an effective way to obtain larger-sized crystals. Using large-sized and high-density tungsten crucible products will become the development trend of the LED industry in the future. [0003] At present, the production process of tungsten crucible includes vapor deposition method, spinning method and powder metallurgy method. Japanese patents (JP03094061, JP03285075) use vapor deposition to prepare tungsten crucibles. Japanese patents use Cu molds or stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/10
Inventor 刘国辉陈锦王铁军刘桂荣曹靖陈飞雄熊宁刘聪之李强
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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