本文主要研究内容
作者（2019）在《Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs》一文中研究指出：Bulk Si2BC3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes（MWCNTs）. The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si2BC3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength（532.1 MPa） and fracture toughness（6.66 MPa m1/2）. Besides, the 2 vol% SiC coated MWCNTs reinforced Si2BC3 N ceramics maintains much higher residual strength（193.0 MPa） after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:（1） the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;（2） the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.
Abstract
Bulk Si2BC3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes（MWCNTs）. The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si2BC3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength（532.1 MPa） and fracture toughness（6.66 MPa m1/2）. Besides, the 2 vol% SiC coated MWCNTs reinforced Si2BC3 N ceramics maintains much higher residual strength（193.0 MPa） after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:（1） the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;（2） the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.
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