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RESEARCH OF MACHINING SURFACE QUALITY OF engineering ceramics

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Chinese Journal of Mechanical engineering 1995年第1期8卷 51-56页

作者： Yu Siyuan Wang Zhongqi Zhao Wankang Chen Xirang(Tianjin University)

Surface quality is an important sublect in the study of machining technology. Because thesurface quality of the ceramic parts has direct effect on their life and reliability, to improve the reliability of structural ceramic parts is an urgent problem which needs to be solved for their furtherwidespread. The authors have done a systematic investigation in the macrostate, geometrical to-pography, surface roughness, deteriorative layer, residual stress and phase change of the machiningsurface of engineering ceramic zirconia and sialon ceramics. Some findings and conclusions of im-portant referential value have been obtained.

关键词： Surface quality engineering ceramics Transmission electron microscopeX-ray diffractometer

Application of plasma arc in cutting engineering ceramics

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Application of plasma arc in cutting engineering ceramics

Research on Plastic Removal Mechanism of engineering ceramics Grinding with Ultrasonic Assistance

第五届海内外青年设计与制造科学会议

作者： Xu Wenji Lu Yishen Jin Zhuji (Dalian University of Technology) Fang Jiancheng (Huaqiao University)

＜正＞To solve the difficult problem of cutting engineering ceramics, the plasma arc cutting method with additional positive pole was offered. The rationale, forms and characteristic of the method were introduced. By means of cutting Al2O3 plates, the affect of each re-confined condition on plasma arc and kerf quality was studied. When the diameter of the nozzle is 4mm, the kerf width is less than 5mm and the cutting speed reaches to 0.8-1 m/min. The method is expected to become a useful technology for cutting engineering ceramics.

关键词： Plasma arc cutting engineering ceramics

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Research on Plastic Removal Mechanism of Engineering Ceramic...

ANALYSIS OF RESIDUAL STRESSES IN engineering ceramics DURING ELECTRICAL DISCHARGE GRINDING

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： GAO Guofu , KONG Qinghua ,ZHAO Bo , LIU Chuanshao Mechanical engineering Department, Tongji University, Shanghai, China,Mechanical and Power engineering Department, Henan Polytechnic University, Henan, China

Plastic Removal Mechanism of engineering ceramics was discussed based on the method of micro-indentation, and the formula of critical wheel depth of cut and the model of material removal ratio were es

关键词： Ultrasonic machining ductile-regime grinding engineering ceramics removal mechanism.

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ANALYSIS OF RESIDUAL STRESSES IN ENGINEERING CERAMICS DURING...

Optimization and design of pigments for heat-insulating coatings

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： YU Lili, LIU Yonghong, LI Xiaopeng, JI Renjie College of Electromechanical engineering, China University of Petroleum, Dongying, 257061, China

The non-uniform high temperature distribution of engineering ceramics generated during electrical discharge grinding results in residual stresses. These residual stresses can decrease the engineering

关键词： Electrical discharge grinding finite element method (FEM) engineering ceramics residual stresses.

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Chinese Physics B 2010年第12期19卷 520-525页

作者：王广海张跃 Key Laboratory of Aerospace Materials and Performance Ministry of EducationSchool of Materials Science and EngineeringBeijing University of Aeronautics and Astronautics

This paper reports that heat insulating property of infrared reflective coatings is obtained through the use of pigments which diffuse near-infrared thermal radiation. Suitable structure and size distribution of pigments would attain maximum diffuse infrared radiation and reduce the pigment volume concentration required. The optimum structure and size range of pigments for reflective infrared coatings are studied by using Kubelka-Munk theory, Mie model and independent scattering approximation. Taking titania particle as the pigment embedded in an inorganic coating, the computational results show that core-shell particles present excellent scattering ability, more so than solid and hollow spherical particles. The optimum radius range of core-shell particles is around 0.3 - 1.6 μm. ~rthermore, the influence of shell thickness on optical parameters of the coating is also obvious and the optimal thickness of shell is 100-300 nm.

关键词： coating engineering ceramics scattering pigments

Unsteady-state Grinding Technology (III) Studies on the Surface Quality

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厦门大学学报（自然科学版） 2002年第S1期41卷 42-43页

作者： XU Yan-shen, HU Jun, LIN Bin, LI Zhi-chao (The State Education Ministry Key Laboratory of High Temperature Structure ceramics and Machining Technology of engineering ceramics, Tianjin University, Tianjin 300072, China)

In conventional grinding theory, the chief removed mode of ceramic coprocessor by diamond tools was brittle removal. In order to perform the plastic removal or ductility processing of engineering ceramics the high degree of accuracy and high rigidity grinner must be using micro grain size diamond grinding wheel to direct the processing of micron below rank depth to prevent form the occurring of the brittle processing zone. This will resulted in the high expense of grinding. The expense of grinding could even reach the 80% of the total manufacture cost of the ceramic part. Ultra-precision grinding for advanced ceramics has been achieved by the unsteady-state grinding technique. In this paper, we mainly deals with observing and analyzing the surface quality of the silicon nitride ground by pink fused alumina wheel in different grinding parameters. To optimize the grinding parameters in the process of the unsteady-state grinding, the experiments of X-ray diffraction, energy spectrum analysis, SEM observation and roughness measurement were performed. The results show that: 1. In the process of unsteady state grinding, high line speed (rotational speed) of the grind wheel can improve the roughness of the silicon nitride apparently. It was also evident that the larger the grain mesh size, the better the surface quality. 2. There exists an optimum combination of grinding conditions such as grinding wheel speed, rotational speed of the workpiece, feed rate between the grinding wheel and the workpiece, grinding times and cutting coolant. The surface quality of the silicon nitride can be up to the standard of mirror finishing. 3. By analyzing the finished surface with X-ray diffraction and energy spectrum, the existence of some new phases including titanium and alumina was proved. 4. By utilizing the unsteady state grinding technique, the surface roughness of Ra ≤ 0.030 μm can be achieved by grinding the silicon nitride with the pink fused alumina wheel in low cost. Based on

关键词： unsteady state grinding theory engineering ceramics grinding surface quality

Interfacial structure and mechanical property of Al2O3 and Invar brazed joint

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China Welding 2016年第4期25卷 68-73页

作者： Zhao Lei Hou Jinbao Li Xiaohong Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024.

This paper introduces a brazing process between Al2O3 ceramic and Invar ***2O3 can be brazed with Invar *** interfacial structure of Al2O3/Invar joint can be expressed as：Invar/Ag（s,s）＋Cu（s,s）＋Fe2Ti（zone Ⅰ）/Ag（s,s）＋Cu（s,s）＋Fe2Ti＋NiTi＋Cu3Ti（zone Ⅱ）/Ag（s,s）＋Cu（s,s）＋Cu2Ti＋Al（s,s）＋TiC＋TiO（zone Ⅲ）/*** maximum shear strength of 139 MPa was measured for as-brazed Al2O3/Invar joint brazed at 850℃ for 25 min or 900℃ for 15 min.

关键词： engineering ceramics ferrous metals and alloys brazing

Effects of precursor solution concentration on dielectric properties of (Pb,La)(Zr,Ti)O_3 antiferroelectric thick films by sol-gel processing

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Journal of Measurement Science and Instrumentation 2013年第3期4卷 294-298页

作者：吕永博郭茂香关新锋丑修建张文栋 Key Laboratory of Instrumentation Science &Dynamic Measurement(North University of China) Ministry of Education

Pb0.97La0.02Zr0.95Ti0.05O3(PLZT)antiferroelectric thick films derived from different precursor solution concentrations are prepared on platinized silicon substrates by sol-gel *** films present polycrystalline perovskite structure with a(100)preferred orientation by X-ray diffraction(XRD)*** antiferroelectricity of the films is confirmed by the double hysteresis behaviors of polarization and double-bufferfly response of dielectric constant under the applied electrical *** properties and dielectric constant are improved while the polarization characteristic values are reduced with the increase of precursor solution *** films at higher precursor solution concentration exhibit excellent dielectric properties.

关键词： engineering ceramics precursor solution concentration microstructure antiferroelectric thick filmCLC number:TB34 Document code:AArticle ID:1674-8042(2013)03-0294-05