Study on the mechanical properties of ZrB2-based ultra-high temperature ceramic composites reinforced by spark plasma sintering (BNNT-BNNP)


【Author】 Yue Chunguang;

【Instructor】 Chen Yao;

[Basic information about the author] Suzhou University, Mechanical and Electronic Engineering, 2013, Master

【Abstract】 ZrB2-SiC based ultra-high temperature ceramic materials have the advantages of high melting point, high hardness, high electrical conductivity, high thermal conductivity, excellent high temperature strength and high temperature oxidation resistance. They have broad application in the aerospace, military and industrial fields. application prospects. However, ZrB2-SiC's poor damage tolerance and low thermal shock resistance (both due to its low fracture toughness) severely limit its wide application. Therefore, how to achieve the strengthening and toughening of ZrB2-SiC has become one of the hot topics in domestic and foreign research. This article adopts the design idea of ​​strong-tough coupling to improve the fracture toughness of ZrB2-SiC. Using ZrB2-SiC as the matrix material and the mixed powder (BNNT-BNNP) of boron nitride nanotubes (BNNT) and boron nitride nanoplatelets (BNNP) as the toughening phase, ZrB2-SiC was prepared by discharge plasma sintering technology. , 0.5wt.% (BNNT-BNNP)/(ZrB2-SiC) and 1.0wt.% (BNNT-BNNP)/(ZrB2-SiC) composite materials. X-ray diffraction and Raman spectroscopy were used to conduct phase analysis of composite materials; through testing methods such as microhardness testing, instrumented micro/nano indentation, and instrumented micrometer indentation, research and analysis (B... More reduction

【Key words】 ultra-high temperature ceramics; nanocomposites; instrumented pressing; instrumented cutting; mechanical properties;