Sintering Techniques of Materials

Abstract

His research areas include recycling PTFE, synthesis of new luminescence phosphors for display, lighting, X-ray imaging and radiation dosimetry. Dr. Arunachalam Lakshmanan is currently working on the development of a third form (other than fission or fusion) of nuclear energy which is eternal and green. He has earlier worked on CERN, Geneva as a scientific Associate and as AvH Fellow at University of Wuppertal, Germany and as a visiting Professor at Postech, South Korea. He has written books and published several papers in international journals and is presently guiding students in their doctoral thesis research work on luminescence.

Spark Plasma Sintering of Negative Temperature Coefficient Thermistor Ceramics

“…In the conventional sintering processes, extremely high sintering temperatures (up to 1600°C) and long holding time (several hours) in air are applied in the fabrication of YCrO 3 ceramics to achieve the highest density and minimum porosity. The poor sinterability of YCrO 3 material is attributed to the loss of Cr 2 O 3 through its volatility during sintering process [30,31]. In our previous work [32,33], YCr 1-x Mn x O 3 (0≤x≤0.5) NTC ceramics with a high relative density have been obtained by combing the Pechini method synthesis and SPS.…”

“…In particular, YCrO 3 having an orthorhombic perovskite structure, has been considered as a candidate for high temperature NTC thermistor applications [19,23,27,28]. However, the material shows poor sinterability and is difficult to densify under ambient atmospheric conditions or through pressureless sintering techniques [29,30]. We have investigated the spark plasma sintering of YCr 1-x Mn x O 3 ceramics and MgAl 2 O 4 -YCr 0.5 Mn 0.5 O 3 composite ceramics, and their NTC electrical properties.…”

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

“…Sintering is a grain growth-induced densification process enabled by atomic diffusion (solid-state reactions) under the driving force of heat energy. To achieve thermistors with high density and minimal porosity, high sintering temperatures and long dwell times are generally employed in the conventional sintering process [10][11][12]. However, at such high temperatures, the spinel structure becomes unstable and decomposes into rock salt (NiO) and Mn-rich spinel phases [10,11,13,14], resulting in the deterioration of the electrical performance.…”

Influence of Synthetic Bone Substitutes on the Anchorage Behavior of Open-Porous Acetabular Cup

“…The development of new implant designs using additive manufacturing technologies [1,2,3,4,5,6] and the integration of property-improving design elements, such as open-porous structures for the treatment of large and small segmental bone defects [7,8,9], requires, inter alia, a verification of suitability for the declared objective. The functional properties of the implants must be demonstrated in addition to surface quality [10,11], cell biological compatibility [12,13], corrosion resistance, and mechanical strength [14,15], which are significantly influenced by the material used.…”