Modified aluminum silicate refractory ceramic fiber, preparation method thereof, and sealing gasket for automobile exhaust gas purifying device
A technology of refractory ceramic fiber and exhaust gas purification device, which is applied in the direction of exhaust device, muffler device, machine/engine, etc., can solve the problem of low output, insufficient aging resistance and fatigue resistance, polycrystalline mullite fiber Expensive and other problems, to achieve the effect of good fatigue resistance and aging resistance, good resilience
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[0036] The invention provides a preparation method of modified aluminum silicate refractory ceramic fiber, comprising the following steps:
[0037] (1) Carry out slag removal treatment to aluminum silicate refractory ceramic fiber, control the slag ball content of fiber after slag removal to be lower than 5wt.%;
[0038] (2) heat treatment is carried out after the fiber after deslagging is mixed with hydrofluoric acid solution, hydrofluoric acid is carried out etching to fiber surface, obtains etching fiber;
[0039] (3) Calcining the etched fibers to obtain modified aluminum silicate refractory ceramic fibers.
[0040] The invention performs slag removal treatment on the aluminum silicate refractory ceramic fiber, and controls the slag ball content of the fiber after the slag removal to be lower than 5wt.%. In the present invention, the aluminum silicate refractory ceramic fiber is a commercially available common aluminum silicate refractory ceramic fiber; the commercially a...
Embodiment 1
[0079] Preparation of modified aluminum silicate refractory ceramic fiber: the raw material aluminum silicate refractory ceramic fiber used is the Fiberfrax fiber purchased from Unifrax company, and its main component is aluminum silicate (40wt.%~60wt.% Al 2 o 3 , 60wt.%~40%wt.% SiO 2 ), with an average diameter of 2 to 5 μm.
[0080] (1) Deslagging: Add the purchased untreated aluminum silicate refractory ceramic fiber and dispersant into water for dispersion to obtain a dispersion; add the dispersion to the equipment of CN201520062324.8 for deslagging treatment, and the treated fiber The slag ball content is 3wt.%;
[0081] (2) Etching: In a polytetrafluoroethylene reactor, add the deslagging fibers and dilute hydrofluoric acid solution (concentration: 0.1mol / L), control the temperature at 25°C, and react for 20 minutes under continuous low-speed stirring.
[0082] (3) Load crystal nucleating aids on the fiber surface: In the reactor, mix the etched fiber with the aluminu...
Embodiment 2～3
[0091] Other steps are identical with embodiment 1, only control the slag ball content of fiber in the slag removal step to be 1% and 5% respectively;
[0092] According to the method of Example 1, the gaskets obtained in Examples 2-3 were subjected to an aging durability test, and the test results are listed in Table 1.
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