Method for improving density of large-thickness fiber-reinforced quartz composite material
A fiber-reinforced and composite material technology, applied in the direction of silica, silicon oxide, etc., can solve the problems that the mechanical properties of fiber-reinforced quartz composite materials cannot meet high-strength performance, and the density of composite materials is difficult to increase, so as to achieve low cost and high shear performance. Effects that boost, boost compression performance
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Embodiment 1
[0029] The needle-punched quartz fiber-reinforced quartz composite material (80mm thick) with a density of 1.50g / cm 3 , compressive strength 44MPa, shear strength 5.0MPa.
[0030] prepared as figure 1 shown in the following steps:
[0031] 1. Activate the benzenesulfonic acid type strong acid cation exchange resin with 1M hydrochloric acid solution 8 times the volume of the resin, and rinse the exchange column with water 8 times the volume of the resin.
[0032] 2. After diluting the industrial-grade water glass solution to a concentration of 5 wt %, ion exchange is performed through an ion exchange column, and the effluent with a pH value of less than 4 is collected.
[0033] 3. Place the composite material as the original base material in the collected orthosilicic acid solution and soak for 10 hours.
[0034] 4. Take out the composite material, drain and dry at 300°C for 1 hour.
[0035] 5. Repeat steps 1 to 4 four times.
[0036] 6. Sinter the composite material at 80...
Embodiment 2
[0039] The three-way orthogonal structure quartz fiber reinforced quartz composite material (83mm thick) that has undergone multiple silica sol impregnation-sintering in the early stage is used as the original substrate, with a density of 1.60g / cm 3 , Compressive strength 100MPa, shear strength 11.0MPa.
[0040] Adopt and embodiment 1 step processing, the density of three-way orthogonal structure quartz fiber reinforced quartz composite material after adopting the method of the present invention is 1.63g / cm 3 , an increase of 1.7%, a compressive strength of 160MPa, an increase of 60%, and a shear strength of 13.5MPa, an increase of 22%.
Embodiment 3
[0042] The 2.5D structure quartz fiber reinforced quartz composite material (70mm thick) that has undergone multiple silica sol impregnation-sintering in the early stage is used as the original substrate, with a density of 1.61g / cm 3 , Compressive strength 90MPa, shear strength 12MPa.
[0043] Adopt and embodiment 1 step processing, the density of 2.5D structure quartz fiber reinforced quartz composite material after adopting the method of the present invention is 1.64g / cm 3 , an increase of 2%, and a compressive strength of 140MPa, an increase of 55%. The shear strength is 15MPa, an increase of 25%.
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