Preparation of the Flexible Green Body of YAG Ceramic Fiber by Melt Spinning

• Published in: Polymers Vol. 14; no. 10; p. 2096
• Main Authors: Liu, Hongmei, Tian, Junjie, Pan, Gangwei, Xie, Yongjin, Yao, Qing
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 20.05.2022; MDPI
• Subjects: Bend radius; Ceramic fibers; Ceramic powders; Ceramics; Efficiency; Extrusion; Feed rate; Flexibility; Heat conductivity; Homogeneity; Lasers; Mechanical properties; Melt spinning; Melt temperature; Microstructure; Particle size; Process parameters; Single crystals; Tensile strength; Thermal conductivity; thermoplastic polyurethane (TPU); YAG ceramic fiber; United States > US; China; YAG ceramic fiber; thermoplastic polyurethane (TPU); flexibility; melt spinning
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14102096

YAG ceramic fiber, with its high thermal conductivity and easy to achieve limit size, provides design flexibility as a laser gain medium. Its mainstream forming method was mainly high-pressure extrusion, but there were disadvantages, such as lack of flexibility. In this work, the flexible green body of YAG ceramic fiber was prepared by melt spinning. The melting characteristics of TPU with four different Shore hardnesses were systematically investigated. The microstructure, element homogeneity of the surface and fracture SEM images of the prepared ceramic fiber were also analyzed in detail. The optimized process parameters of YAG ceramic fiber preparation were as follows: the melting temperature was 220 °C, the screw feed rate of the double-cone screw extruder was F = 15.0 mm/min and the TPU-95A# was used. The ceramic fiber with the mass ratio of TPU-95A# to ceramic powder = 4:6 had the best microstructure quality. It had good flexibility and could be knotted with a bending radius of about 2.5 mm, and the tensile strength reached approximately 20 MPa. These results are crucial for advancing YAG ceramic fiber applications.