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Preoxidation method of kovar leads for metal housings

A metal shell, pre-oxidation technology, applied in the direction of metal material coating process, etc., can solve the problem that the thickness of the oxide layer, the air tightness and sealing strength of dense products cannot be reliably guaranteed, and the air tightness and sealing strength are reduced. The strength and equipment requirements are very high, and the effects of good pre-oxidation consistency, low energy consumption and simple operation procedures are achieved.

Inactive Publication Date: 2014-01-15
宜兴市吉泰电子有限公司
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AI Technical Summary

Problems solved by technology

Using the controlled nitrogen-based atmosphere oxidation method to oxidize metal leads is better, but it requires high equipment and relatively large investment, which is difficult for small enterprises to invest.
However, the air oxidation method and water vapor oxidation method are used for pre-oxidation, and the thickness and density of the oxide layer, as well as the airtightness and sealing strength of the product cannot be reliably guaranteed.
Moreover, when the above oxidation method is implemented, a large number of lead wires are stacked in disorder in a container and then placed in a furnace for oxidation. During the oxidation process, the lead wires cannot be turned over, so the parts where the lead wires touch each other will cover each other, so that the oxide layer at these covered points should be thinner. The oxide layer on the normal surface, if this covering point is just at the junction of the glass insulator, it may reduce the airtightness and sealing strength

Method used

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Embodiment Construction

[0015] The invention discloses a chemical oxidation method for the pre-oxidation of a lead wire of a metal packaging shell, which comprises the following steps:

[0016] Step 1. Prepare a container for holding and pre-oxidizing. The material of the container can be glass, plastic and other materials that will not chemically react with the solution;

[0017] Step 2, add water, oxidant and other reagents according to the proportion, stir and filter the solution for clarification and set aside;

[0018] Step 3, use a balance to weigh the amount of Kovar wire that needs to be pre-oxidized, and clean it;

[0019] Step 4, put the cleaned Kovar lead into the container holding the pre-oxidation solution;

[0020] Step 5. When the solution and the surface of the Kovar wire start to generate bubbles, that is, the surface of the wire starts to oxidize, the solution should be stirred from time to time and the wire turned over, and the contact point should be changed from time to time, so...

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Abstract

The invention discloses a preoxidation method of kovar leads for metal housings. In the method, a solution chemical oxidation method is used as a preoxidation process of the kovar leads for the metal housings. The chemical oxidation method is used for preparing an oxidant-containing chemical solution to perform preoxidation on the kovar leads. Compared with the air oxidation and controllable nitrogen-base atmosphere oxidation method used at home and abroad in the prior art, the method has the advantages of simple operation, good consistency in preoxidation and the like.

Description

technical field [0001] The invention relates to the packaging field of electronic and optoelectronic products, in particular to a method for pre-oxidizing kovar wires for metal packaging shells, which uses a chemical oxidation solution containing an oxidant to pre-oxidize kovar wires for metal shells The method belongs to the field of manufacturing metal packaging shells. Background technique [0002] In the manufacturing process of the metal package shell, it is necessary to sinter the metal lead wire and the metal shell with a special glass insulator to form a whole shell. The role of insulation and airtight protection. Kovar is a metal alloy whose main content is iron, nickel and cobalt, also known as 4J29 alloy. It is a relatively special constant expansion metal alloy. Because its expansion coefficient is close to that of glass insulators, Kovar alloy is often used to manufacture metal package enclosures. Since the pure metal surface and the molten glass will not pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73
Inventor 史祖法
Owner 宜兴市吉泰电子有限公司
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