Synthesis and microstructure evolution of β‐Sialon fibers/barium aluminosilicate (BAS) glass‐ceramic matrix composite with enhanced mechanical properties

Abstract

Barium aluminosilicate (BAS, BaO-Al 2 O 3 -2SiO 2 ) glassceramic material shows excellent thermal stability, high oxidation resistance, high melting point (1760°C), and low dielectric constant. These features have resulted in the widespread use of BAS composites in the area of integrated circuit substrate, electronic package, LCD monitor, refractory composites, and so on. [1][2][3][4][5][6][7][8][9][10][11][12] Whereas the intrinsic low toughness problem has restricted the wider range of applications. Carbon fiber, [13][14][15][16] SiC fiber, [17][18][19] and CNTs [20][21][22][23] are commonly introduced in the glass-ceramic matrix to improve mechanical properties. However, these materials were found to show different drawbacks in the relative researches, such as the poor oxidation resistance of carbon fiber 24 ; the high price of SiC fiber; and the complex synthesis steps of CNTs. 25 Sialon, as a solid solution of Si 3 N 4 , consists of α-Sialon, β-Sialon, O-Sialon, and X-Sialon phases. Among them, β-Sialon is known for the high fracture toughness and excellent thermal stability, making it superior over other reinforcement materials when dealing with high temperature. 4 So the combination of Sialon and BAS not only solves the fatal brittleness problem of BAS, but also improves the thermal performance of BAS matrix.It has been demonstrated that one-dimensional materials, such as nanowires, whiskers, and fibers, exhibit unique structures and properties, which are exploited to build up nano-scale reinforcements. [26][27][28][29] Significant efforts have been devoted for in situ synthesizing one-dimensional Sialon materials inside ceramic matrix materials. [30][31][32] In these researches,

Thermal Conductive Networks Constructed by Sialon Fibers in-Situ Synthesized in Barium Aluminosilicate Glass-Ceramic

“…Compared with our previous study [47], the content of the material is adjusted in this work, Li + is added to promote the phase transformation of monoclinic-celsian matrix, which has better compatibility with Sialon phase [48]. The XRD patterns of composites with different carbon contents are shown in Figure 4.…”