摘要
By using micron α-SisN4, SiO2, Al2O3 and h-BN as starting materials, O＇ -SiAION-BN （ Si2-z AlzO1 ＋z N2-z, z= 0. 3） composite was synthesized by reaction sintering. According to theoretical proportion ratio： n（ SiO2）/n（ α-Si3N4） = 1, the effects of two sintering aid composites, Y2O3 ＋ B2O3 and Y2O3 ＋ TiO2 at 1700℃ for 2h, were studied. The results indicate that Y2 O3 ＋ TiO2 as sintering aid can accelerate reaction sintering of O＇ -SiAION-BN more effectively than Y2O3 ＋ B2O3, and the relative density of the composites declined with the increase of BN addition （10%, 20% and 30% respectively）; XRD analysis found that excessive β-Si3N4 existed in the O＇ -SiAION-BN composite. Therefore, in order to get more pure O＇ -SiAION and BN phases in the composites ore SiO2 is needed. When Y2O3 ＋ TiO2 was used as sintering aid and addition of BN was 10%, the result of cross experiment on condition of A- n（SiO2）/n（α-Si3N4） was 1.05, 1.1 and 1.2; B-- addition of sintering aid was 2%, 4% and 6% ; C-- firing temperature was 1600℃, 1650℃ and 1700℃ ; D--soaking time was 1h, 2h and 3h, shows that the sintering properties were influenced by factors of firing temperature, soaking time, addition of sintering aid and n（ SiO2 ）/n（α-SisN4） in order of importance. In addition, the technical parameter A s B 3 C s D3 can achieve the highest relative density. Besides, using Pattern Recognition method, the optimized parameter range to form pure O＇ -SiAION and BN without β-Si3N4 remained was determined as Y 〉 1024X^2 - 230. 400X ＋ 11.088 （ X = 0. 9999A -0. 0006C - 0. 0163D, Y = 0. 0163A ＋ 0. 009B -0. 0014C ＋0. 9999D）.
By using micron α-SisN4, SiO2, Al2O3 and h-BN as starting materials, O＇ -SiAION-BN （ Si2-z AlzO1 ＋z N2-z, z= 0. 3） composite was synthesized by reaction sintering. According to theoretical proportion ratio： n（ SiO2）/n（ α-Si3N4） = 1, the effects of two sintering aid composites, Y2O3 ＋ B2O3 and Y2O3 ＋ TiO2 at 1700℃ for 2h, were studied. The results indicate that Y2 O3 ＋ TiO2 as sintering aid can accelerate reaction sintering of O＇ -SiAION-BN more effectively than Y2O3 ＋ B2O3, and the relative density of the composites declined with the increase of BN addition （10%, 20% and 30% respectively）; XRD analysis found that excessive β-Si3N4 existed in the O＇ -SiAION-BN composite. Therefore, in order to get more pure O＇ -SiAION and BN phases in the composites ore SiO2 is needed. When Y2O3 ＋ TiO2 was used as sintering aid and addition of BN was 10%, the result of cross experiment on condition of A- n（SiO2）/n（α-Si3N4） was 1.05, 1.1 and 1.2; B-- addition of sintering aid was 2%, 4% and 6% ; C-- firing temperature was 1600℃, 1650℃ and 1700℃ ; D--soaking time was 1h, 2h and 3h, shows that the sintering properties were influenced by factors of firing temperature, soaking time, addition of sintering aid and n（ SiO2 ）/n（α-SisN4） in order of importance. In addition, the technical parameter A s B 3 C s D3 can achieve the highest relative density. Besides, using Pattern Recognition method, the optimized parameter range to form pure O＇ -SiAION and BN without β-Si3N4 remained was determined as Y 〉 1024X^2 - 230. 400X ＋ 11.088 （ X = 0. 9999A -0. 0006C - 0. 0163D, Y = 0. 0163A ＋ 0. 009B -0. 0014C ＋0. 9999D）.
