Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived（PD） and spraying technology, via using vinyl-polysilazane（PSN-1） as a preceramic polymer and Si3N4 and lithium alumino...Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived（PD） and spraying technology, via using vinyl-polysilazane（PSN-1） as a preceramic polymer and Si3N4 and lithium aluminosilicate（LAS） powders as fillers. The phase and microstructure of the coatings were analyzed by X-ray diffraction（XRD） analysis and scanning electron microscopy（SEM）, respectively. The effect of the coatings on mechanical property and humidity resistance of the porous Si3N4 ceramic was investigated. The experimental results showed that we successfully fabricated the uniform and dense coating which preferably combined with the substrate upon the addition of fillers. The bending strength of the porous Si3N4 ceramic sprayed the coating increased by more than 18%, and the surface hardness increased by 1.7 times. The apparent porosity of the materials reduced by an average of 97.7%, and water absorption was below 0.5%. Therefore, the prepared coating with preferable density had an obviously moisture-proof and enhanced effect on the porous Si3N4 ceramic.展开更多
Surfactants are extensively used in daily life and industrial production, posing significant challenges to global sustainability. Household detergents, including dishwashing detergents and laundry, alone account for o...Surfactants are extensively used in daily life and industrial production, posing significant challenges to global sustainability. Household detergents, including dishwashing detergents and laundry, alone account for over 40% of the global surfactant market [1].展开更多
为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层...为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层涂层的渗水率最低为0.027 25%,当改良剂Hardener VP LS 2959质量分数为4%时,聚氨酯防水涂料性能最佳,可解决针孔、气泡、鼓包等问题。展开更多
文摘Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived（PD） and spraying technology, via using vinyl-polysilazane（PSN-1） as a preceramic polymer and Si3N4 and lithium aluminosilicate（LAS） powders as fillers. The phase and microstructure of the coatings were analyzed by X-ray diffraction（XRD） analysis and scanning electron microscopy（SEM）, respectively. The effect of the coatings on mechanical property and humidity resistance of the porous Si3N4 ceramic was investigated. The experimental results showed that we successfully fabricated the uniform and dense coating which preferably combined with the substrate upon the addition of fillers. The bending strength of the porous Si3N4 ceramic sprayed the coating increased by more than 18%, and the surface hardness increased by 1.7 times. The apparent porosity of the materials reduced by an average of 97.7%, and water absorption was below 0.5%. Therefore, the prepared coating with preferable density had an obviously moisture-proof and enhanced effect on the porous Si3N4 ceramic.
文摘Surfactants are extensively used in daily life and industrial production, posing significant challenges to global sustainability. Household detergents, including dishwashing detergents and laundry, alone account for over 40% of the global surfactant market [1].
文摘为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层涂层的渗水率最低为0.027 25%,当改良剂Hardener VP LS 2959质量分数为4%时,聚氨酯防水涂料性能最佳,可解决针孔、气泡、鼓包等问题。
