Method for preparing molybdenum tube

A molybdenum tube and a preparation process technology, applied in the field of metal tubes prepared by powder metallurgy, can solve the problems of difficult control of tube diameter and tube wall thickness, large amount of mechanical processing, poor wall thickness uniformity, etc., and achieve small sintering deformation, Small sintering shrinkage and good uniformity

Inactive Publication Date: 2010-02-10
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned existing molybdenum tube preparation methods, there are shortcomings such as difficult control of tube diameter and tube wall thickness, poor wall thickness uniformity, easy deformation during sintering, and large amount of machining

Method used

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  • Method for preparing molybdenum tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The particle size is 4.0μm, and the bulk density is 2.8g / cm 3 , 50kg of molybdenum powder with good fluidity is used as a spare. The molybdenum powder was placed in 150kg of water-based binder polyvinyl alcohol solution with a concentration of 20%, and stirred evenly for 2 hours. Then pour the molybdenum powder mixture into a centrifugal forming machine for molding at a speed of 3000 rpm. Stop the centrifugal forming machine, lift out the mold carefully, and demould the formed molybdenum tube billet. Afterwards, drying is carried out at a drying temperature of 200° C. and a drying time of 4 hours.

[0025] The dried molybdenum tube billets are subjected to degumming treatment at a degumming temperature of 600°C for 3 hours. Pre-sinter the molybdenum tube without the forming agent, the pre-sintering temperature is 1100°C, and the time is 4h.

[0026] The pre-sintered molybdenum tubes were sintered in an intermediate frequency furnace, the sintering temperature was 19...

Embodiment 2

[0029] The particle size is 3.5μm, and the bulk density is 1.7g / cm 3 10kg of molybdenum powder with good fluidity is used for spare. Put the molybdenum powder in 40kg of water-based binder polyvinyl alcohol solution with a concentration of 30%, and stir evenly for 2 hours. Afterwards, pour the molybdenum powder mixture into a centrifugal forming machine for forming at a speed of 5000 rpm. Stop the centrifugal forming machine, lift out the mold carefully, and demould the formed molybdenum tube billet. Afterwards, drying is carried out at a drying temperature of 200° C. and a drying time of 2 hours.

[0030] The dried molybdenum tube billets are subjected to degumming treatment at a degumming temperature of 600°C for 3 hours. Pre-sinter the molybdenum tube without the forming agent, the pre-sintering temperature is 1100°C, and the time is 4h.

[0031] The pre-sintered molybdenum tubes were sintered in an intermediate frequency furnace, the sintering temperature was 1900°C, a...

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Abstract

The invention relates to a method for preparing a molybdenum tube, in particular to a method for preparing a metal tube by a powder metallurgy method. The method is characterized by comprising the following steps: (1) evenly mixing a raw material molybdenum powder with water base adhesive solution; (2) placing the molybdenum powder and the water base adhesive solution in a centrifugal forming machine for forming; (3) drying a formed molybdenum tube blank; (4) degumming the dried molybdenum tube blank; (5) pre-sintering the degummed molybdenum tube blank; (6) sintering on the pre-sintered molybdenum tube at a high temperature; and (7) polishing the sintered molybdenum tube to obtain the molybdenum tube. By adopting the method of the invention, the preparation process of the molybdenum tubehas the advantages of easy control and simple, safe and reliable operation, thus being applicable to batch production; the preparation process can help flexibly control parameters such as diameter, wall thickness, length and the like of the molybdenum tube; and the prepared molybdenum tube has good uniformity, small sintered deformation quantity and small sintered shrinkage rate.

Description

technical field [0001] A method for preparing a molybdenum tube relates to a method for preparing a metal tube by adopting a powder metallurgy method. Background technique [0002] Molybdenum tube is a special-shaped product of molybdenum, which can be used to make electron tube anode bottom and lead-out rod, magnetron sputtering molybdenum tube target, glass tank furnace bubble tube, thermocouple protection sleeve, etc. The main preparation methods of molybdenum tubes are: machining molybdenum rods into tubes, powder metallurgy (isostatic pressing molybdenum tube blanks, sintering, machining, etc.), spinning forming methods, and drawing forming methods. In the above-mentioned existing molybdenum tube preparation methods, there are disadvantages such as difficult control of tube diameter and tube wall thickness, poor wall thickness uniformity, easy deformation during sintering, and large amount of mechanical processing. Contents of the invention [0003] The object of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/12B22F3/16
Inventor 武洲郭军刚卜春阳李晶
Owner JINDUICHENG MOLYBDENUM CO LTD
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