[mamta]

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Hi I would like to have information about the Glass to Metal Seals and also the details about the Dumet Seals and also about Seals Using Dumet Wire?

[Vishal Kotkar]

When developing glass vacuum gadgets, glass to metal seals are required to get electrical associations through the glass envelope. The issue is that the metal must have a co-effective of development which is fundamentally the same as the glass. This is especially essential with pop lime glass. It is additionally critical that the glass bonds well to the metal.

Dumet Seals

In 1911, Fink and Eldred presented a progressive new kind of seal. Nickel/Iron amalgams can be made with an extensive variety of development co-efficients which cover that of glass. The issue is that seals made with Nickel/Iron wire are regularly permeable. It likewise endures a concoction response with the glass amid the fixing operation which causes gas rises to shape. Copper seals well to glass, yet has the wrong extension co-effective. The progression which Fink and Eldred made was to make a wire which has a Nickel/Iron center attached to a sleeve of copper. The thicknesses and development co-efficients are picked so that the spiral extension coordinates that of the glass. The hub extension is not as much as the glass, yet the anxiety is taken up by the copper sheath. This sort of seal is presently known as a Dumet seal. It is articulated 'dew-met'. It is utilized as a part of CRTs, vacuum tubes, fluorescent tubes and fiber lights. Dumet seals can be effectively recognized by their red appearance inside the glass.

Seals Using Dumet Wire

Dumet wire is difficult to obtain in small quantities and eventually found a 3kg reel of 0.35mm diameter borated Dumet wire from JLC Electromet in India.