中文摘要：

为提高陶瓷喷砂嘴抗冲蚀磨损能力,缓解喷嘴入口、出口的高应力状态,采用热压烧结工艺制备了Al2O3＋（W,Ti）C/Al2O3＋TiC三层对称型叠层陶瓷材料及叠层陶瓷喷嘴.研究结果表明：叠层陶瓷材料表层较之相应单一材料而言,具有更高的硬度和断裂韧性;在相同的冲蚀磨损条件下,叠层陶瓷喷嘴的抗冲蚀磨损性能较非叠层陶瓷喷嘴有显著的提高;试验分析叠层陶瓷喷嘴的最佳层厚比为2.此外,采用有限元法对叠层陶瓷喷嘴在制备过程中的残余应力进行了理论计算,给出了叠层陶瓷喷嘴中残余应力与层厚比的关系.研究表明,残余压应力的存在,细化了晶粒,提高了叠层材料表层的硬度和断裂韧性,是叠层陶瓷喷嘴其抗冲蚀磨损能力提高的原因.理论分析最佳层厚比也为2,理论分析与试验结果相互印证.

英文摘要：

Al2O3 ＋ （ W, Ti） C/Al2O3 ＋ TiC duced by hot pressing in order to reduce the prove their erosion wear resistance. The test symmetric laminated ceramic materials and nozzles were protensile stress at the entry and the exit region of nozzles and imresults show that both hardness and toughness of laminated ceramic materials are improved than the simple materials. Under same erosion conditions, the laminated ceramic nozzles have superior erosion wear resistance to that of the common ceramic nozzle ; the experimental value of optimal layer thickness ratio is 2. In addition, the residual thermal stress generated in the preparation of laminated ceramic materials is analyzed by finite element method （FEM）. Relationship between stress distribution and layer thickness ratio is obtained. It is suggested that the residual thermal stress lead to grain refining mechanical properties strengthening, and improve the erosion wear resistance of laminated ceramic nozzles improving. The theoretical value of optimal layer thickness ratio is 2, the experimental results are consistent with the theoretical prediction.