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Investigation of phase Transformation and Tougning Mechanism of Zirconla/Metal Functional Matrix by Grinding

氧化锆/金属功能基体磨削相变及磨削机理研究

基本信息

批准号：
07650156
负责人：
ISONO Yoshitada
金额：
$ 1.6万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650156/
关键词：
Functional matrix zirconia nickel diamond wheel grinding martensite transformation residual compressive stress 研削加工 m相量曲げ強度

项目摘要

The functional matrix is the most miracle composite as the future industrial materials. But, there are only a few data in the manufacturing process. Here, the grinding characteristics are investigated for the new product of zirconia/nickel composite. Especiaaly, the influences to its strength characteristics of these composites by the toughening mechanism and surface characteristics induced by grinding are cleared. In zirconia/nickel composite, the bending strength increase with the large constituent rates of zirconia. Because the particle size of nickel is larger than that of zirconia, the crack transmitted in nickel particle on the fracture. Then, the toughening may be due to crack transmission by a lot of zirconia particles. The monoclinic phase increase with the increase of nickel contents. In cooling process of composites, the martensite transformation is induced by the compressive stress of zirconia by the large shrinkage of nickel.The surface roughness and the monoclinic phase o … More n the ground surface increase with the large grits sizes of diamond abrasive grain. The increment rate of monoclinic phase decreases with the large contents of zirconia. Furthermore, in the rich zirconia composite, the bending strength and the monoclinic phase increase with the large size of abrasive grains. On the other hand, the surface roughness increase with the low wheel speed. The monoclinic phase and the bending strength increase with the high wheel speed. This is due to the increase of martensite transformation by the impact force in the high wheel speed. On the contrary, in over 50% nickel composites, the monoclinic phase decrease and the bending strength increase with the high wheel speed in the composites over 50% nickel.The residual stress is measured on the polished sample after grinding with SD140/170 wheel. The part of zirconia is filled by the residual compressive residual stress. These residual stresses and the monoclinic phase increase with the large centents of nickel. But, the 100% nickel reside the tensile residual stress in it. This is due to the martensite transformation on the ground surface. In other word, the volume expansion by the phase transformation of zirconia induced the compressive residual stress in nickel. Less

功能基质是未来工业材料中最神奇的复合材料。但是，在制造过程中只有很少的数据。本文对新产品氧化锆/镍复合材料的磨削特性进行了研究。特别是明确了磨削增韧机理和表面特性对复合材料强度特性的影响。在氧化锆/镍复合材料中，随着氧化锆含量的增加，复合材料的抗弯强度也随之提高。由于镍的颗粒尺寸大于氧化锆的颗粒尺寸，裂纹在断口上以镍颗粒的形式传播。因此，增韧可能是由于大量氧化锆颗粒的裂纹传播所致。单斜晶相随镍含量的增加而增加。复合材料在冷却过程中，由于镍的大收缩，氧化锆受压应力作用，诱发马氏体相变。表面粗糙度和…单斜相磨粒尺寸越大，磨粒表面的磨粒越多。随着氧化锆含量的增加，单斜相的增加率减小。此外，在富氧化锆复合材料中，随着磨料颗粒尺寸的增大，复合材料的抗弯强度和单斜相也随之增加。另一方面，砂轮转速越低，表面粗糙度越大。单斜晶相和抗弯强度随砂轮转速的提高而增大。这是由于高速轮速下冲击力增加了马氏体相变所致。而在镍含量超过50%的复合材料中，随着砂轮转速的提高，复合材料的单斜晶相减少，弯曲强度增加。氧化锆石的一部分由残余压应力填充。这些残余应力和单斜相随着镍含量的增加而增加。但是，100%的镍存在于其中的拉伸残余应力中。这是由于磨削表面的马氏体相变造成的。也就是说，氧化锆相变引起的体积膨胀引起了镍的残余压缩应力。较少