UV喷墨打印技术越来越多地被用于装饰建材领域,从广告包装衍生到家居装饰、木制品覆面打印等,促进了对木质打印基材的应用研究。以杨木胶合板为基材,设置不同的杨木基材表面底涂工艺和不同的UV喷墨打印参数,通过UV颜料墨水喷墨在基材承...UV喷墨打印技术越来越多地被用于装饰建材领域,从广告包装衍生到家居装饰、木制品覆面打印等,促进了对木质打印基材的应用研究。以杨木胶合板为基材,设置不同的杨木基材表面底涂工艺和不同的UV喷墨打印参数,通过UV颜料墨水喷墨在基材承印表面标版色块的附着力、耐磨性、粗糙度、硬度、光泽度和L a b值的测试,以及利用SEM表征颜料墨水喷印层与杨木结合的界面形貌,通过实验对比与观察,研究出基于杨木胶合板基材表面使UV喷墨打印层理化性能最佳的工艺方案。结果表明:在杨木胶合板上采用透明漆工艺处理并以200%质量分数白墨喷印铺底打印的标版色块试样,其附着力和硬度最佳;涂刷透明底漆和白底漆等底漆工艺能够有效提高承印面的平整度,减少UV喷墨涂层的粗糙度;白墨喷印层能有效提高涂层耐磨性和硬度,但在平整度较好的表面打印时,由于其及时固化的特点会使粗糙度有所提高;彩色墨水与白底漆的结合力不及与白墨铺底的处理方式;杨木胶合板的色泽偏黄,在不覆盖底色的前提下打印会使图案光泽度有所降低,图像饱和度偏高。展开更多
A transient three dimensional model for describing the temperature behavior, thermo-capillary convection, microstructure evolution and the resultant mechanical properties during selective laser melting of AIN/AlSilOMg...A transient three dimensional model for describing the temperature behavior, thermo-capillary convection, microstructure evolution and the resultant mechanical properties during selective laser melting of AIN/AlSilOMg composite is proposed. The powder-solid transformation, temperature dependent physical properties and the preservation of the heat are taken into account. The effect of the additive manufacturing multilayer feature on the molten pool dynamics, cooling rate, crystal size, microstructure morphology, micro-hardness and types of the residual stress has been investigated. It shows that the operating temperature and the thermo-capillary convection obtained within the molten pool generally increases as the processing multilayers are successively added, while the thermal effect depth is negatively reduced. The preferential direction of the heat diffusion generally changes from a downward pattern, then to the slightly strengthened horizontal direction and finally to a typically horizontal one for various deposited layers being processed. Therefore, the microstructure of the solidified part along the building direction （Region 1 to Region V） undergoes an interesting transformation： directional columnar cellular microstructure, crosswise-extended cellular microstructure, refined cellular microstructure, fragmentation microstructure and the coarse cellular microstructure. The tensile stress and the compressive stress are comprehensively obtained within the finally solidified layers, significantly influencing the microhardness.展开更多
文摘UV喷墨打印技术越来越多地被用于装饰建材领域,从广告包装衍生到家居装饰、木制品覆面打印等,促进了对木质打印基材的应用研究。以杨木胶合板为基材,设置不同的杨木基材表面底涂工艺和不同的UV喷墨打印参数,通过UV颜料墨水喷墨在基材承印表面标版色块的附着力、耐磨性、粗糙度、硬度、光泽度和L a b值的测试,以及利用SEM表征颜料墨水喷印层与杨木结合的界面形貌,通过实验对比与观察,研究出基于杨木胶合板基材表面使UV喷墨打印层理化性能最佳的工艺方案。结果表明:在杨木胶合板上采用透明漆工艺处理并以200%质量分数白墨喷印铺底打印的标版色块试样,其附着力和硬度最佳;涂刷透明底漆和白底漆等底漆工艺能够有效提高承印面的平整度,减少UV喷墨涂层的粗糙度;白墨喷印层能有效提高涂层耐磨性和硬度,但在平整度较好的表面打印时,由于其及时固化的特点会使粗糙度有所提高;彩色墨水与白底漆的结合力不及与白墨铺底的处理方式;杨木胶合板的色泽偏黄,在不覆盖底色的前提下打印会使图案光泽度有所降低,图像饱和度偏高。
基金supported by the NSFC-DFG Sino-German Research Project(GZ 1217)the National Natural Science Foundation of China(51575267,51322509)+5 种基金the National Key Research and Development Program(2016YFB1100101)the Key Research and Development Program of Jiangsu Provincial Department of Science and Technology of China(BE2016181)the 333 Project(BRA2015368)the Aeronautical Science Foundation of China(2015ZE52051)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe financial support from the Funding of Jiangsu Innovation Program for Graduate Education(KYLX15_0301)
文摘A transient three dimensional model for describing the temperature behavior, thermo-capillary convection, microstructure evolution and the resultant mechanical properties during selective laser melting of AIN/AlSilOMg composite is proposed. The powder-solid transformation, temperature dependent physical properties and the preservation of the heat are taken into account. The effect of the additive manufacturing multilayer feature on the molten pool dynamics, cooling rate, crystal size, microstructure morphology, micro-hardness and types of the residual stress has been investigated. It shows that the operating temperature and the thermo-capillary convection obtained within the molten pool generally increases as the processing multilayers are successively added, while the thermal effect depth is negatively reduced. The preferential direction of the heat diffusion generally changes from a downward pattern, then to the slightly strengthened horizontal direction and finally to a typically horizontal one for various deposited layers being processed. Therefore, the microstructure of the solidified part along the building direction （Region 1 to Region V） undergoes an interesting transformation： directional columnar cellular microstructure, crosswise-extended cellular microstructure, refined cellular microstructure, fragmentation microstructure and the coarse cellular microstructure. The tensile stress and the compressive stress are comprehensively obtained within the finally solidified layers, significantly influencing the microhardness.
