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Insulated and sealed metal air tube

A technology of insulation sealing and metal tube, which is applied in the field of metal connection, and can solve problems such as poor sealing, low bonding force of metal and oxide solder, separation of metal and oxide solder, etc.

Active Publication Date: 2013-05-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among them, in the oxide solder method, the bonding force between metal and oxide solder is relatively low. In the process of heating or cooling, since the thermal expansion coefficients of metal, ceramic and oxide solder cannot be completely consistent, certain stress will be generated. Metal and oxide solders are prone to dislodgement at the sealed joint, resulting in a poor seal

Method used

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  • Insulated and sealed metal air tube
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  • Insulated and sealed metal air tube

Examples

Experimental program
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Effect test

preparation example Construction

[0057] The preparation method of the insulating and sealed air pipe of the present invention comprises the following steps:

[0058] Apply oxide sealing slurry to both ends of the ceramic tube, and dry to obtain an oxide sealing layer;

[0059] One end of the ceramic tube is butted with one end of the first metal tube, the other end of the ceramic tube is butted with one end of the second metal tube, and the end of the first metal tube that is not connected with the ceramic tube is not connected with the second metal tube. The connecting end of the ceramic tube is provided with a fixing device, which fixes the first metal tube, the ceramic tube and the second metal tube.

[0060] In the invention, the oxide sealing slurry is firstly coated on both ends of the ceramic tube and dried to form an oxide sealing layer. The oxide sealing layer seals the gap between the metal pipe and the ceramic pipe. The oxide sealing slurry is a mixture of oxide powder and solvent, and its prepar...

Embodiment 1

[0067] 20 g SiO 2 , 55g B 2 o 3 , 25 grams of Al 2 o 3 Mix evenly by ball milling, melt at 1400°C, and pour into cold water to form glass. The glass is crushed and passed through a 40-mesh sieve to obtain glass sealing filler powder. 80 grams of glass sealing filler powder, 1 gram of ethyl cellulose, and 19 grams of terpineol were uniformly mixed and ground by a three-roll mill to prepare an oxide material sealing slurry.

[0068] Clean the surface of metal pipes and ceramic pipes.

[0069] The oxide material sealing slurry is evenly coated on both ends of the ceramic tube, and dried at 110°C.

[0070] Butt the two metal tubes with the ceramic tube respectively, and install such as figure 2 Alumina ceramic parts, alumina fiber felt, and high-temperature stainless steel screws form a fixing device, in which alumina fiber felt is used as an elastic component, and high-temperature stainless steel screws are used as fasteners. Tighten the high-temperature stainless steel ...

Embodiment 2

[0080] 20 g SiO 2 , 55g B 2 o 3 , 25 grams of Al 2 o 3 Mix evenly by ball milling, melt at 1400°C, and pour into cold water to form glass. The glass is crushed and passed through a 40-mesh sieve to obtain glass sealing filler powder. 80 grams of glass sealing filler powder, 1 gram of ethyl cellulose, and 19 grams of terpineol were uniformly mixed and ground by a three-roll mill to prepare an oxide material sealing slurry.

[0081] Clean the surface of metal pipes and ceramic pipes.

[0082] The oxide material sealing slurry is evenly coated on both ends of the ceramic tube, and dried at 110°C.

[0083] Put the metal tubes at both ends into the ceramic tubes, and install such figure 2The semi-industrial alumina ceramic parts, alumina fiber felt and high-temperature stainless steel screws form the fixing device, in which the alumina fiber felt is used as the elastic component, and the high-temperature stainless steel screw is used as the fastener. Tighten the high-tempe...

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Abstract

The invention provides an insulated and sealed metal air tube. The insulated and sealed metal air tube comprises a first metal tube, a second metal tube, a ceramic tube for communicating the first metal tube with the second air tube, and a fixing device, wherein one end of the ceramic tube is butted with one end of the first metal tube, and an oxide sealing layer is arranged at the butted joint; the other end of the ceramic tube is butted with one end of the second metal tube, and an oxide sealing layer is also arranged at the butted joint; and the fixing device is arranged, at one end of the first metal tube, which is not butted with the ceramic tube, and one end of the second metal tube, which is not butted with the ceramic tube, so that the first metal tube, the ceramic tube and the second metal tube are fixed. The first metal tube and the second metal tube are respectively connected with two ends of the ceramic tube by the oxide sealing layers, and the fixing device exerts a certain stress to the first metal tube, the ceramic tube and the second metal tube, so that the metal tubes are closely connected with the ceramic tube. A good sealing property of the insulated and sealed metal air tube can be still ensured especially in a heating or cooling process.

Description

technical field [0001] The invention relates to the field of metal connections, in particular to insulating and sealing metal air pipes. Background technique [0002] Ceramic and metal sealing is a technology that uses ceramic media to connect metals. This technology keeps metals working at high temperatures insulated. It is mainly used in vacuum electronic devices, semiconductors, integrated circuits, electric light sources, laser atomic energy, chemical industry, Metallurgy, power equipment and other industries. [0003] There are three main methods of sealing between ceramics and metals: [0004] One is the sintered metal powder method, that is, firstly, a metal layer is sintered on the ceramic at high temperature in a reducing atmosphere, so that the surface of the ceramic has metallic properties, and then it is welded with the metal to complete the bonding between the ceramic and the metal. seal. [0005] One is the active metal method, which uses transition metal el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
Inventor 杨成锐王蔚国叶爽苗鹤沈圣成
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI