What are the requirements for auxiliary materials of mechanical seals
Posted by yunying258 on April 8th, 2020
After deformation, it can be used for a long time. In addition to soft PVC, common auxiliary sealing materials are rubber and PTFE.
1. PTFE has the advantages of excellent chemical stability, oil resistance, solvent resistance, moisture resistance, low coefficient of friction, etc. The disadvantage of being suitable for various corrosive media is that its elasticity is inferior to rubber and easy Produce permanent deformation.
2. Rubber Rubber has better elasticity, cushioning, vibration absorption, heat resistance and corrosion resistance. Rubber seals have good sealing effect and are widely used. Commonly used rubbers are silicone rubber, nitrile rubber, neoprene rubber and fluorine rubber.
Elastic element material For Mechanical Seal
1. Spring material The requirements of the spring material are: good elasticity and resistance to medium corrosion. Common spring materials are stainless steel spring steel (1Cr18Ni9Ti, etc.), chromium steel (3Cr13, 4Cr13, etc.), carbon cable spring steel (60si2Mn, etc.) and phosphor bronze.
2. Bellows material The requirements of the bellows material are: good welding performance, great elasticity, and certain corrosion resistance. Commonly used bellows materials are iron-based, copper-based and nickel-based alloys, and titanium materials. Generally, nickel-chromium austenitic steel strips in titanium-based materials are the main materials, especially 1Cr18Ni12Mo2Ti. The high-nickel elastic alloy is considered to be an ideal material for manufacturing bellows. When using conventional welding techniques, aluminum-containing materials encounter difficulties. At present, the most widely used bellows material is AM350 (about Cr16Ni45MnMo3N), which is a solid solution with low strength, low hardness and high elongation.
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