The thermal shock resistance of Y4Si2O7N2-BN composites has been systematically studied in this paper.The thermal stress fracture resistance parameter,R1 of Y4Si2O7N2-30vol.%BN composite is higher than that of Y4Si2O7N2 and Y4Si2O7N2-20vol.%BN composite.Then the critical temperature difference(ΔTc) of Y4Si2O7N2-30vol.%BN composite is determined to be 850~900 K.The excellent thermal shock resistance is attributed to the lamination structure of h-BN grain which could dissipate the energy by healing up during heating and delamination during cooling.
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