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The drying process is non-uniform at the microscopic level. During the skeleton aging stage, the inner walls of capillary pores unevenly distribute block-like thin layers of liquid. As evaporation pro......
2025-01-03After the drying reaches the critical point, the evaporation rate of water begins to decrease further. At this time, the contraction of the solid skeleton has stopped. At this stage, the transfer of l......
2025-01-03At the beginning of the silica sol coating gel, the skeleton is very soft and the capillary tension in the system is also small. As the water evaporates and the gel skeleton shrinks, the mechanical st......
2025-01-03In the initial stage of gel drying, the free water part (4) is mainly evaporated. After the water evaporates, a meniscus pointing inward is generated on the surface of the gel network mesopores. If th......
2025-01-02Silica sol silica particles form the solid skeleton of the gel, and water is filled in it as a dispersion medium. There are four forms of water in the gel: (1) Water directly adsorbed on silica partic......
2025-01-02After the silica sol coating soaks the mold, due to the evaporation of water on the coating surface, a humidity difference will be generated between the surface and the interior. Driven by the humidit......
2024-12-31Silica sol coating is a mixture of adhesive silica sol, refractory powder and a small amount of functional additives. The process of silica sol investment casting shell making is essentially the gelat......
2024-12-31The process of forming gel under appropriate conditions with a certain concentration of sol is called gelation. In the gelation process of silica sol, the colloidal particles form a capillary network......
2024-12-30The continuous dispersed phase constitutes the solid skeleton of the gel, the continuous dispersion medium forms the fluid part of the gel, and the particle size that constitutes the colloid makes the......
2024-12-30Also called frozen gel. Under certain conditions, the colloidal particles in the sol can be connected to each other to form a spatial network structure. The structural gaps are filled with liquid as a......
2024-12-27From the definition of colloid, as long as the particle size of the dispersed phase in different aggregation states is between 1 and 100 nm, a colloidal system can be formed in different states of the......
2024-12-26First of all, colloid is not a special substance, nor is it the nature of matter, but a special state of matter. The colloidal system is characterized by the dispersed phase particles having a certain......
2024-12-25Silica sol is a high-quality water-based binder commonly used in investment casting. Since it was introduced into investment casting in the 1960s, the process technology of shell making has been conti......
2024-12-24High-quality precision castings with smooth surfaces and clear edges and corners require high-quality investment casting shells. The physical and chemical properties of the shell at a macroscopic leve......
2024-12-23Generally, the shelf life of silica sol paint is about one year. Considering the sensitivity of silica sol to temperature, it is generally stored indoors as much as possible, not below zero degrees no......
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