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Electronic grade silica sol has significant characteristics such as high purity, high molecular weight and stable chemical properties. Its purity is usually higher than 99.99%, and can even reach 99.9......
2025-01-06As an important inorganic material, silica sol has shown a wide range of application prospects in many fields due to its unique physical and chemical properties. In particular, electronic grade silica......
2025-01-06The sol-gel and gel drying stages of the investment shell do not proceed sequentially but occur simultaneously or overlap, leading to phenomena such as creep due to uneven stress distribution within t......
2025-01-06FD Type I fast-drying silica sol, after being aluminum-modified, can shorten the gelation time. During the drying process of the gel, due to the high supersaturation of SiO2 colloidal particles, a lar......
2025-01-06Capillary contraction force is proportional to the surface tension of the liquid. In silica sol-type shells, the liquid in the capillary pores is mainly water. In ethyl silicate-type shells, the liqui......
2025-01-03The 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......
2024-12-27
