Research on the gradual process of the structure and mechanical properties of NanoZnO-coated veneer

Abstract

In this paper, Pinus sylvestris L. var. mongholica Litv veneer was used as the research object, and nanoZnO-coated veneer was prepared by magnetron sputtering. Based on XRD and nanoindenter, energy-dispersive spectroscopy and fluorescence microscope, the structure and mechanical properties, surface elements and fluorescence effect of the materials were characterized, and the gradual process of the structure and mechanical properties of nanoZnO-coated veneer was explored. The deposition of ZnO film on the surface of wood caused the main diffraction peaks (101) and (002) of cellulose to decrease in intensity, and the reduction in (002) characteristic peaks exceeded 10%. With the increase in the coating time, the characteristic diffraction peaks of ZnO gradually appeared. For the sample with a sputtering time of 75 min (200 °C), the film growth has a high degree of C-axis preferred orientation. The prepared nanoZnO-coated veneers have the common structural characteristics of wood and ZnO. With the increase in coating time, the load displacement of the sample sustained to decrease, the elastic modulus and hardness gradually increased. Among them, the sample with a coating time of 75 min (200 °C) reduced the loading displacement by 50%, the elastic modulus and hardness increased by 4.45 times and 5.8 times, respectively. It can be seen that the deposition of ZnO thin film on the surface of wood by magnetron sputtering has changed the microstructure of the wood surface, enhanced the wood resistance to elastic deformation, and improved the mechanical properties of the wood surface.