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Articles on Ceramics
Synthesis of aluminium nitride under 2.45 GHz microwave irradiation
Aluminium nitride (AlN) is a functional ceramic which has several properties, and it is applied to substrate materials and fillers for packaging materials of electronic devices. Microwave heating has characteristics such as internal heating, rapid heating and selective heating, so it is useful for sy...
Causes of failure of ceramic-on-ceramic and metal-on-metal hip arthroplasties.
We identified the etiologies of early failures of hard-on-hard bearing surfaces for ceramic-on-ceramic and metal-on-metal THAs. We retrospectively reviewed records of 2907 THAs with hard-on-hard bearing surfaces implanted between 1996 and 2009; 1697 (58%) had ceramic-on-ceramic and 1...
Grinding of steel–ceramic–composites
Steel–ceramic composites offer a high potential as protective layers of mechanically and abrasively highly loaded parts. However, the machining of steel–ceramic composites is a great challenge for the process design due to the very different mechanical properties of the brittle ceramic particles...
Structural, thermal and dielectric properties of ferroelectric Pb1–xCaxTiO3 ceramics
We have prepared Ca–doped PbTiO3 of general formula Pb1–xCaxTiO3 with x = 0.00, 0.1 and 0.3. The polycrystalline ceramic samples of these materials have been prepared by standard solid state reaction method using high purity oxides and carbonates. The formation of compounds has been checked by X...
Optimisation of Nd:YAG laser micro–turning process using response surface methodology
The present paper investigates the laser micro–turning operation on cylindrical aluminium oxide (Al2O3) ceramic to study the influence of different process parameters namely, laser average power, pulse frequency, workpiece rotational speed, assist air pressure and Y feed rate on surface roughness (...
Process control for ultrasonic hole–drilling in hard brittle materials
We vibrate the workpiece and control the motion of the tool, which is constrained by an aerostatic bearing and generated by a voice coil actuator. We use the voice coil to measure the force acting between tool and workpiece. We measure the tool displacement with an Eddy current sensor. Using the two...
The role of new core pigment in enhancing the properties of glass–ceramics based on raw materials
Cobalt aluminate imparts blue colour and diverse demanded properties to glass composites. In this work, a new core–shell pigment based on kaolin as the core covered with a nano– and micron–sized surface layer of cobalt–magnesium aluminate comprising its shell was introduced to glass composite...
Study on surface roughness in ultrasonic vibration mill–grinding of hot–pressed Si3N4
In order to investigate the influence of machining parameters on surface roughness in ultrasonic vibration mill–grinding of hot–pressed silicon nitride, the mechanism of the ultrasonic vibration mill–grinding is analysed. Kinematic analysis of abrasive grain indicates that grains and workpiece...
Improvement in grinding of composite ceramic by using cryogenic cooling technique
Ceramic materials are getting widely used in many engineering applications. These ceramic materials need to be ground to obtain desired dimensional accuracy and surface finish for engineering components. However, the ground ceramic components mostly contain surface/subsurface microcraks, temperature...
An approach for identification of mode in micro grooving of sintered alumina
New materials usually require new manufacturing processes to create the final shape, with desired bulk and surface properties. The knowledge of the mode of material removal of these new materials in manufacturing is required for better understanding of material removal mechanism. In the present work,...