Over the years, people have used various methods to make high-performance refractories, such as the use of dispersed particle strengthening to increase the strength and toughness of refractories. Because the cracks hit the powder particles, the pinning of the powder particles will change the direction of the cracks. A portion of energy is consumed to prevent further crack propagation. In addition, it is also possible to manufacture high-strength, toughened refractories by adding fibers. Obviously, if the added powder particles or fibers have a fractal structure, such powder particles or fibers can play a greater role in absorbing crack energy. When the crack encounters the fractal structure additive particles (dispersed powder particles or fibers), the secondary structure of the crack spalls, and some air may remain inside the fragment of the fractal structure, so that the additive has a certain compressive elasticity, coupled with its huge surface area. So that the additive absorbs crack energy more efficiently. The study of the fractal structure of cracks near the interface of additives can also predict the ability of the interface to absorb energy and thus prevent further crack propagation in the material.
Silica mist is often added as a flow agent to food and medicine packaging bags, because the silica mist has a large surface area, which helps to eliminate moisture that may be present during product packaging. Simultaneously, siliceous fog is encapsulated and food particles are increased. The frictional force can effectively prevent the powder from agglomerating under pressure during storage and transportation. However, inhalation dust generated when the package is opened does not cause silicosis, because the silica powder in the silica mist is an amorphous silica. Silica powder that causes silicosis in the refractory industry is usually crystalline silica powder.
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