以Si3N4、Al N、Al2O3和c BN为原材料,采用放电等离子烧结,在氮气、氩气和真空三种不同烧结气氛下制备Si Al ON/c BN陶瓷复合材料.通过XRD、SEM及力学性能评估等手段研究了材料的物相组成、显微组织、体积密度、硬度以及断裂韧性等性能...以Si3N4、Al N、Al2O3和c BN为原材料,采用放电等离子烧结,在氮气、氩气和真空三种不同烧结气氛下制备Si Al ON/c BN陶瓷复合材料.通过XRD、SEM及力学性能评估等手段研究了材料的物相组成、显微组织、体积密度、硬度以及断裂韧性等性能.结果表明:真空气氛下制备的Si Al ON/c BN陶瓷复合材料显微组织相对致密,具有较高的体积密度、硬度和断裂韧性.展开更多
Cubic boron nitride(cBN)grinding wheels play a pivotal role in precision machining,serving as indispensable tools for achieving exceptional surface quality.Ensuring the sharpness of cBN grains and optimizing the grind...Cubic boron nitride(cBN)grinding wheels play a pivotal role in precision machining,serving as indispensable tools for achieving exceptional surface quality.Ensuring the sharpness of cBN grains and optimizing the grinding wheel’s chip storage capacity are critical factors.This paper presents a study on the metal-bonded segments and single cBN grain samples using the vacuum sintering method.It investigates the impact of blasting parameters-specifically silicon carbide(SiC)abrasive size,blasting distance,and blasting time-on the erosive wear characteristics of both the metal bond and abrasive.The findings indicate that the abrasive size and blasting distance significantly affect the erosive wear performance of the metal bond.Following a comprehensive analysis of the material removal rate of the metal bond and the erosive wear condition of cBN grains,optimal parameters for the working layer are determined:a blasting distance of 60 mm,a blasting time of 15 s,and SiC particle size of 100#.Furthermore,an advanced simulation model investigates the dressing process of abrasive blasting,revealing that the metal bond effectively inhibits crack propagation within cBN abrasive grains,thereby enhancing fracture toughness and impact resistance.Additionally,a comparative analysis is conducted between the grinding performance of porous cBN grinding wheels and vitrified cBN grinding wheels.The results demonstrate that using porous cBN grinding wheels significantly reduces grinding force,temperature,and chip adhesion,thereby enhancing the surface quality of the workpiece.展开更多
本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微...本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微波吸热的效能,这在烧结温度峰值上得到了体现。α∶β比值因此降低了,各项机械性能得到了改善,突出表现在复合物断裂韧性的改善方面。另外,本研究列出了针对实验室微波辅助烧结过程的能量消耗估算数据。最终,本研究确定获得最高相对密度(97.1%)、维氏硬度(13.35±0.47 GPa)以及断裂韧性(7.52±0.54 MPa·m^(1/2))的试验条件为1 300℃下烧结30 min。展开更多
文摘以Si3N4、Al N、Al2O3和c BN为原材料,采用放电等离子烧结,在氮气、氩气和真空三种不同烧结气氛下制备Si Al ON/c BN陶瓷复合材料.通过XRD、SEM及力学性能评估等手段研究了材料的物相组成、显微组织、体积密度、硬度以及断裂韧性等性能.结果表明:真空气氛下制备的Si Al ON/c BN陶瓷复合材料显微组织相对致密,具有较高的体积密度、硬度和断裂韧性.
基金Supported by National Natural Science Foundation of China(Grant Nos.92160301,92060203,52175415,52205475,and 52205493)Science Center for Gas Turbine Project(Grant Nos.P2022-AB-IV-002-001 and P2023-B-IV-003-001)+3 种基金Jiangsu Provincial Natural Science Foundation(Grant No.BK20210295)the Huaqiao University Engineering Research Center of Brittle Materials Machining(Grant No.2023IME-001)Foundation of Graduate Innovation Centre in NUAA(Grant No.XCXJH20230509)Fundamental Research Funds for the Central Universities(Grant Nos.NS2023028 and NG2024015).
文摘Cubic boron nitride(cBN)grinding wheels play a pivotal role in precision machining,serving as indispensable tools for achieving exceptional surface quality.Ensuring the sharpness of cBN grains and optimizing the grinding wheel’s chip storage capacity are critical factors.This paper presents a study on the metal-bonded segments and single cBN grain samples using the vacuum sintering method.It investigates the impact of blasting parameters-specifically silicon carbide(SiC)abrasive size,blasting distance,and blasting time-on the erosive wear characteristics of both the metal bond and abrasive.The findings indicate that the abrasive size and blasting distance significantly affect the erosive wear performance of the metal bond.Following a comprehensive analysis of the material removal rate of the metal bond and the erosive wear condition of cBN grains,optimal parameters for the working layer are determined:a blasting distance of 60 mm,a blasting time of 15 s,and SiC particle size of 100#.Furthermore,an advanced simulation model investigates the dressing process of abrasive blasting,revealing that the metal bond effectively inhibits crack propagation within cBN abrasive grains,thereby enhancing fracture toughness and impact resistance.Additionally,a comparative analysis is conducted between the grinding performance of porous cBN grinding wheels and vitrified cBN grinding wheels.The results demonstrate that using porous cBN grinding wheels significantly reduces grinding force,temperature,and chip adhesion,thereby enhancing the surface quality of the workpiece.
文摘本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微波吸热的效能,这在烧结温度峰值上得到了体现。α∶β比值因此降低了,各项机械性能得到了改善,突出表现在复合物断裂韧性的改善方面。另外,本研究列出了针对实验室微波辅助烧结过程的能量消耗估算数据。最终,本研究确定获得最高相对密度(97.1%)、维氏硬度(13.35±0.47 GPa)以及断裂韧性(7.52±0.54 MPa·m^(1/2))的试验条件为1 300℃下烧结30 min。
