Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta in...Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta ined by choosing suitable dispersant, solvent, particle size distribution etc. B esides these factors, the homogenizing procedure is also a key step. In this paper, reaction sialon suspensions were prepared using 3-wt% KD1 as dis persant in organic media composed of 60-vol% methyletheylketone and 40-vol% et hanol. Different homogenizing procedures have been used and compared, including planetary milling, low energy ball milling and ultrasonic disaggregation. The ef fects of different homogenizing routes and mixing times on the rheology and stab ility of suspensions, and on the microstructure of slip casting green bodies, ha ve been studied. The varying dispersion efficiencies observed could be attribute d to differences in deagglomeration degrees achieved and in adsorption amount of dispersant onto the surface of reaction sialon powders.展开更多
Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy ana...Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy analysis has been carriedout at the HF 6-31G展开更多
文摘Homogeneous, high concentrated ceramic suspensions wi th low viscosity are the key controlling factors for the production of ceramic c omponents through colloidal processing. A well-dispersed suspension can be obta ined by choosing suitable dispersant, solvent, particle size distribution etc. B esides these factors, the homogenizing procedure is also a key step. In this paper, reaction sialon suspensions were prepared using 3-wt% KD1 as dis persant in organic media composed of 60-vol% methyletheylketone and 40-vol% et hanol. Different homogenizing procedures have been used and compared, including planetary milling, low energy ball milling and ultrasonic disaggregation. The ef fects of different homogenizing routes and mixing times on the rheology and stab ility of suspensions, and on the microstructure of slip casting green bodies, ha ve been studied. The varying dispersion efficiencies observed could be attribute d to differences in deagglomeration degrees achieved and in adsorption amount of dispersant onto the surface of reaction sialon powders.
文摘Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy analysis has been carriedout at the HF 6-31G
