Mechanical seal cemented carbide in combination with silicon carbide
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Has anyone experienced a situation where a cemented carbide rotating ring is used in combination with a silicon carbide stationary ring? What are the advantages and disadvantages of this approach?
A hard-to-hard pairing is chosen when the medium contains solid particles, has crystalline precipitates, or has a high viscosity. The advantages and disadvantages depend on the operating conditions of the medium, and cannot be generalized.
According to the API682 standard, when the medium contains particles, is prone to crystallization, and has high viscosity, it is better to use silicon carbide for both the stationary and rotating rings. But what are the advantages of using cemented carbide in combination with silicon carbide here?
Used a lot! Durable and corrosion-resistant. Relatively brittle
I would like to ask what the advantages are of using cemented carbide combined with silicon carbide, as compared to using cemented carbide combined with more cemented carbide
Material matching is determined through comprehensive consideration of operating conditions, and its advantages and disadvantages need to be discussed within specific operating scenarios. Refer to API682: 1. When the sealed medium is oil, tungsten carbide exhibits excellent end-face fitting performance with silicon carbide ； 2. In low-viscosity liquid conditions, such as water containing abrasive materials, tungsten carbide is the most common choice over silicon carbide. It usually contains abrasive particles, has high medium viscosity, tends to crystallize, the medium polymerizes, and the parameters are high; therefore, hard-to-hard pairings are typically used. When the equipment vibrates or suffers damage during installation, cemented carbide with good toughness is usually used as the moving ring. The above is for reference only.
Generally, it is avoided to use the same material for the stationary and rotating rings; if the materials are identical, adhesion may occur at high temperatures