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Monatomic silicon sol of step dissolution method

Heating medium directly dissolved in water (soft water), less impurities, silica colloidal particle shape, size, degree of Summer Day, pH, density and purity are easy to control. l system. Uniform spherical particles, mass density (see Figure 2), stable performance, good quality Shangyu ss I Figure 2 TEM image of a 30-sol, rubber uniform and round, clear edge grain cavity, and Japan 1430 The colloidal silica sol similar shape. This test used silica sol Shangyu in Zhejiang plant, the process is as follows (Figure 1) t won a Bu Bu Zhen circle a circle of Shangyu, Zhejiang i dissolved silicon process according to factory production process Luk 2 Kin-determination of silica for the testing of Japanese Snowlew830 and two kinds of sol 1430, Shanghai,[link widoczny dla zalogowanych], silica sol, silica sol, and a factory in Hubei and southern China, the SiO: content were 30%, with elemental silicon sol Shangyu performance comparison test for the following e from Table 1, the Shangyu ss of a single mass of silicon 30 Physical properties of silica sol sol close to 1430 in Japan. 2.1 2.2 physical properties of the shell process performance test used in Australia if the British cabinet and close the county of Henan bauxite (AI: O, content> 80 \refractory powder, add weekly selection of coal gangue powder layer, paired with a variety of silicon cavity spot coating, comparison tests, as shown in Table 2,3 and Figure 3. From Table 2, at a constant temperature environment. When the paint stick degree of control in the 25s were, different silica powder liquid ratio of the gaps in the table 3, 4, 5, silica powder liquid ratio of 2.4 were less than 2 elemental silica powder liquid ratio is low; check the type of shell cavity surface, showing that low-powder liquid ratio of silica sol shell cavity of the surface roughness is also somewhat larger. gangue from Table 3, reinforcing layer silica coating, the viscosity under the same conditions , 3, 4, 5 cupboard liquid silica is also lower than, the same results in Table 2, I reinforced layer coating powder liquid ratio is low, also contributed to the low-temperature strength of shell one of the factors in Table 5. From Table 2, Table 3 shows,[link widoczny dla zalogowanych], 2 coating for Shangyu SS - 30 single quality silica, the pink liquid is relatively high, and Japan 830,1430 sol quite conducive to shell quality and high-temperature strength. Figure 3 shows the silica sol Determination of rheological properties of coatings, can be seen from the figure,[link widoczny dla zalogowanych], four curves did not pass the origin of coordinates, convex to the shear stress axis, indicating that the silica coating are pseudoplastic with yield stress fluids, with shear thinning properties, should have better mobility; which domain 1 Gong minimum apparent viscosity of the line, so the mobility is the best,[link widoczny dla zalogowanych], followed curve 2, indicating that Shangyu ss - 30 of silicon mobility cavern with Japanese close to 830. Henan county high density silica coating prepared bauxite,[link widoczny dla zalogowanych], when the viscosity control in the 20s, its powder liquid ratio between the 2 to 2.1, the ratio is basically the same rules and Table 2, it is not another list of instructions. 2.3 degree of silica sol shell Meng test in comparison to some of the silica coating, casting Co., Ltd. in Wuxi Chang-site shell production casting, while the system test of the determination of shell strength sample, measured at room temperature and high temperature strength, Shell Technology for comparison tests in Table 4, the type of shell strength in Table 5 Table 4 silica sol coating shell making bore type specimen No. Si Phan production methods fMPa) 1000C-site pouring strength (MPa) the 1st car 830.14302 Shangyu Hubei s ss ~ 303 285 a 304 a Shanghai factory 3o South dissolution method of elemental silicon ion exchange resin Ion exchange resin Ion exchange resin paste hit 303030282.832.742.752.307567.317} .186.176.13 good good Table 4 are used in the shell making the existing technology of the factory workshop. car is equipped with dehumidifiers and thermostats asked installations, with the hot air blast. from the values in Table 5 show that the silica sol Shell's high temperature strength of the Japanese chamber 830 and 1430 silicon Tao highest, lt) O0C high-temperature strength of 7.56MPa, Shangyu ss to 30 high-temperature strength of silica 7.3] MPa, and Japan silica considerable; temperature strength of the Silica species were at the same level, the difference is small. site production casting test 1 .2, 3 shell sample showed no leakage phenomenon, indicating that the high temperature strength is good. 3 a. discussion of the results of elemental silicon produced by the dissolution method silica sol, the use of industrial pure silicon as the raw material, low impurity content, quality and easy to control, determined by transmission electron microscopy, particles evenly rounded grain shape, quality, dense, medium size, good high temperature strength of shell, and Japan Snoetew silicon solution cavity quality quite. b. elemental silica and stable performance. The field production and application of more than six months, shell strength and good surface quality can be used to gradually replace imported fused silica casting touch. (Editor: Photo summary of I beetle) 12

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