Method for manufacturing silicon carbide friction pair for mechanical sealing
A technology for mechanical seals and manufacturing methods, applied in the directions of engine seals, mechanical equipment, engine components, etc., can solve the problems of brittleness and fragmentation, low mechanical strength, cracks, brittleness or fragmentation, etc., to enhance mechanical strength. , to solve the effect of easy brittleness and fragmentation
Inactive Publication Date: 2018-01-05
蒋立宪
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Problems solved by technology
However, the friction pair made of silicon carbide has a fatal weakness, that is, its mechanical strength is very low, it is very fragile, and it is easy to be brittle and broken under uneven pressure conditions.
Many manufacturers and users of mechanical seals have the same personal experience, that is, the friction pairs of mechanical seals made of silicon carbide materials are easily cracked, brittle or broken by external forces during loading and unloading during transportation and transshipment, resulting in become waste products and cannot be used; and manufacturers or users may also cause fragmentation and waste products due to slight improper force during the process of assembling and installing mechanical seals, resulting in waste of finished products and loss of time
This has been a headache in the industry, and no more effective solution has been proposed so far
Method used
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Embodiment 1
[0009] Embodiment 1: A process flow for manufacturing a brittle crack-resistant mechanical seal silicon carbide friction auxiliary moving ring with an outer diameter of 80 mm, an inner diameter of 30 mm, and a thickness of 10 mm. First, use mechanical cutting to produce a square ring-shaped iron-nickel alloy ring. The size specifications are: outer diameter 60mm, inner diameter 50mm, thickness 5mm, for later use; take an appropriate amount of additives, and an appropriate amount of silicon carbide powder with a particle size of ≤1μm. Mix the two evenly and place them in a graphite mold. At the same time, put the spare square ring-shaped iron-nickel alloy ring into the mixed silicon carbide powder. At this time, care must be taken to keep the iron-nickel alloy ring Place in the center of the mixed silicon carbide powder; then, pressurize (30-50Mpa) in a hot-press furnace at 2000-2100°C. After taking it out, it is further shaped and processed; after standing at room temperature ...
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The invention relates to a method for manufacturing a silicon carbide friction pair for mechanical sealing. The friction pair for the mechanical seal is made of iron-nickel alloy, silicon carbide powder with particle size ≤ 1 μm and appropriate additives by hot pressing and sintering. Its manufacturing process is to put metal, silicon carbide powder and additives mixed uniformly according to the specified ratio into graphite molds, and pressurize (30-50Mpa) in a hot-press furnace at 2000-2100°C. The material produced by the method can be used for corrosion-resistant mechanical seal friction pairs.
Description
technical field [0001] The invention relates to a method for manufacturing a silicon carbide friction pair for mechanical sealing. Background technique [0002] Silicon carbide has a hardness close to that of diamond and has outstanding wear resistance. Silicon carbide is one of the most widely used materials in mechanical seals. In addition to melting strong alkali and strong oxidizing gas at high temperatures, silicon carbide can also be used stably in full-concentration sulfuric acid and caustic alkali with a close boiling point, especially in Corrosion and wear resistance maintained over a wide temperature range. However, the friction pair made of silicon carbide has a fatal weakness, that is, its mechanical strength is very low, it is very fragile, and it is easy to be brittle and broken under uneven pressure conditions. Many manufacturers and users of mechanical seals have the same personal experience, that is, the friction pairs of mechanical seals made of silicon c...
Claims
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Inventor 蒋立宪
Owner 蒋立宪