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Seamless metal pipe and its production method

A technology of metal and seamless tubes, applied in the direction of tubes, rigid tubes, discharge tubes, etc., can solve problems such as thin thickness and difficult metal tubes

Inactive Publication Date: 2002-05-01
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using this production method, it is extremely difficult to obtain metal pipes with thin thickness and small diameter

Method used

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  • Seamless metal pipe and its production method
  • Seamless metal pipe and its production method
  • Seamless metal pipe and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Mix 12g ethylcellulose (binder), 30g butyl carbitol acetate (solvent), and 10g containing Al 2 o 3 The additives were added to 1000 g of W (melting point = 3422° C.) powder. The mixture was passed 10 times through a three-roll mill.

[0064] The mixture was shaped using an extruder and the extrudate was dried in air at 80°C for 2 hours.

[0065] The dried material was calcined at 1900° C. for 3 hours in hydrogen. In order to remove the binder and prevent Mo oxidation, wetting was performed to obtain a dew point of 0°C.

[0066] Through the above treatment, the porosity of the fabricated Mo tube is 8%, and the leakage rate in the He leakage experiment is ≤1.0×10 -10 atm·cc / s.

[0067] As described above, the present invention can provide a seamless pipe made of metal and a method of producing the seamless pipe made of metal, which can be produced in a thin thickness and a small inner diameter although the workability of the pipe is low, and which has mechanical stre...

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Abstract

A metal-made seamless pipe contains, as a main component, at least one kind of metal selected from the group consisting of metals each having a melting point of 1,600 DEG C or more. The metal-made seamless pipe has a porosity of 0.3 to 25% when the porosity is defined as a proportion of the open pores not perforating in the thickness direction of the pipe, present at the outer surface of the pipe, to the total area (100%) of the outer surface of the pipe; and a process for producing such a metal-made seamless pipe. The metal-made seamless pipe is low in processability but can be produced in a small thickness and a small inner diameter, is superior in mechanical strengths and gastightness, and can be suitably used as a sealing member of a translucent vessel of a high-pressure discharge lamp.

Description

technical field [0001] The present invention relates to a metal seamless pipe and a method for producing such a pipe. More specifically, the present invention relates to a seamless tube made of metal, which can be produced in a thin thickness and a small inner diameter although its workability is low, and a method for manufacturing the seamless tube made of a metal. Excellent in mechanical strength and airtightness, for example, such a seamless pipe is suitable for use as a sealing member (for example, a translucent vessel made of ceramics) of a translucent container such as a high-voltage discharge tube (for example, a metal halide tube). Background technique [0002] like Figure 5 As shown, a translucent ceramic tube 20 (translucent tube) is used as a translucent container for a high-voltage discharge vessel 10 (such as a metal halide tube). Since the translucent container contains a highly corrosive emissive material (such as dysprosium iodide), Corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J5/36B22F3/11B22F5/10C04B38/00C22C32/00H01J61/36
CPCB22F5/106C22C32/0031H01J61/366B22F3/1103
Inventor 新见德一
Owner NGK INSULATORS LTD