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Molybdenum blank preparing method

A preparation process, molybdenum powder technology, applied in the field of molybdenum billet preparation, can solve the problem that it is difficult to meet the number of grains for production

Inactive Publication Date: 2011-02-09
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the particle size of molybdenum powder used in industry is generally between 2 and 5um, which is difficult to meet the production requirements and the number of grains can reach 5,000 to 20,000 / mm 2 , Molybdenum billets with grain size of 300~800nm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Fully mix 0.5-1um submicron molybdenum powder in a mixer for 5 hours, take 1000g of molybdenum powder and press it on a hydraulic press with a pressing pressure of 100MPa. The blank was fired in an intermediate frequency furnace at a sintering temperature of 500°C for 120min, 800°C for 120min, 1250°C for 120min, 1500°C for 120min, and 1700°C for 300min. The obtained molybdenum blank has a density of 9.95g / cm 3 , the number of grains is 10000 / mm 2 , the grain size is 700nm

Embodiment 2

[0014] Fully mix 0.5-1um submicron molybdenum powder in a mixer for 5 hours, take 1000g of molybdenum powder and press it on a hydraulic press with a pressing pressure of 100MPa. The blank was fired in an intermediate frequency furnace at a sintering temperature of 500°C for 120min, 800°C for 120min, 1250°C for 120min, 1500°C for 120min, and 1600°C for 120min. The obtained molybdenum blank has a density of 9.90g / cm 3 , the number of grains is 16000 / mm 2 , The grain size is 500nm.

Embodiment 3

[0016] Fully mix 0.5-1um submicron molybdenum powder in a mixer for 5 hours, take 1000 grams of molybdenum powder and press it into a molybdenum rod on an isostatic press with a pressing pressure of 120MPa. The blank was fired in an intermediate frequency furnace at a sintering temperature of 500°C for 120min, 800°C for 120min, 1250°C for 120min, 1500°C for 120min, and 1700°C for 240min. The obtained molybdenum blank has a density of 9.96g / cm 3 , the number of grains is 12000 / mm 2 , The grain size is 680nm.

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Abstract

The invention discloses a molybdenum blank preparing method, and relates to a method for preparing a pure molybdenum blank with the grain number of 5,000 to 20,000 / mm<2> and the grain size of 300 to 800nm. The molybdenum blank preparing method is characterized in that: in the preparation process, submicron-scale molybdenum powder with the granularity of 0.5 to 1um is taken as a raw material and is pretreated, molded and sintered into a molybdenum blank. In the molybdenum blank preparing method, the molybdenum powder is taken as a raw material, and the molybdenum blank with fine grains can be prepared by reducing sintering temperature and shortening the sintering time, and has the density of 9.8 to 10.0, the grain number of 5,000 to 20,000 / mm<2> and the grain size of 300 to 800nm. The submicron-scale molybdenum powder is taken as the raw material for preparing the molybdenum blank with fine grains, special requirements on production equipment are absent, and the method is suitable for industrial production.

Description

technical field [0001] A method for preparing molybdenum blanks, involving a crystal grain number of 5000-20000 / mm 2 1. A method for preparing pure molybdenum blanks with a grain size of 300-800nm. Background technique [0002] The preparation method of molybdenum billet usually adopts the method of powder metallurgy, the preparation process uses molybdenum powder as raw material, after pretreatment, molding, sintering to make molybdenum billet. The particle size and distribution of molybdenum powder have a great influence on the density and grain size of sintered products. At present, the particle size of molybdenum powder used in industry is generally between 2 and 5um, which is difficult to meet the production requirements and the number of grains can reach 5,000 to 20,000 / mm 2 , Molybdenum blanks with a grain size of 300-800nm ​​are required. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing crystal grains w...

Claims

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Application Information

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IPC IPC(8): B22F3/16
Inventor 唐丽霞黄晓玲薛夏英郭军刚卜春阳崔玉清
Owner JINDUICHENG MOLYBDENUM CO LTD
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