Development of Online Defect Detection System for High End Wires

Wire rods are drawn into various diameters in multi pass wire drawing machines. These drawn wires should be free from surface defects. Sometimes surface defects are observed in finished wires which can be caused due to poor wire rod surface quality or can be generated during wire drawing process. At present quality assurance is based on visual inspection. Surface quality of entire length of drawn wire cannot be ensured by the existing system causing defective wires delivered to customers. There is a need to develop and implement a low cost online defect detection system to ensure that the finished wires are free from surface defects. In this work, a new system for online inspection of thin wires has been developed. The system will be capable of detecting various types of defects like sliver, transverse crack, fin and lap discontinuities that commonly arise in the process of wire drawing based on the signature of the received signal. This paper will demonstrate the need and way forward to develop a low cost defect identification system for thin wires

Magnetic properties of FeCo alloy nanoparticles synthesized through instant chemical reduction

International audienc

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

International audienc

Morphology and magnetic properties of FeCo alloy synthesized through polyol process

Equiatomic FeCo alloy was synthesized through polyol process and size reduction was attempted using heterogeneous nucleating agents such as Cu and Pt. The average particle size of FeCo reduced from 138 to 17 nm using 5x10(-6) M of Pt whereas significant size reduction could not be achieved with Cu up to 1x10(-5) M. The as-prepared FeCo and the particles prepared using Cu as nucleating agent revealed a flower-like morphology whereas the shape crumbled with Pt nuclei. All the FeCo nanoparticles exhibited exchange bias effect due to the oxide layer present as a shell. The exchange bias field and coercivity at 15 K were 185 Oe and 1016 Oe, respectively, for the particles synthesized using Pt as a nucleating agent.Department of Science & Technology (India) CRG/2018/00093

To Establish the Feasibility of IR Thermography for Sorting of Iron Ores for Identifying & Rejecting Alumina Rich Ores

Indian Iron & Steel Industry is nearly a century old & growing at a rapid pace which has become the world‘s fifth-largest producer of crude steel. India has large reserves of relatively high quality iron ore of which 60% is hematite but generally contains high alumina as an impurity. The alumina content in Iron-ore fines used in sinter making all over the world is less than 1% in contrast to Indian ore fines are as high as 3% which leads to increased slag viscosity, more coke consumption & CO2 emission above international benchmarks resulting in reduced blast furnace productivity. To increase the blast furnace productivity, iron content should be more than 65%, alumina content should be less than 2% and alumina/silica ratio should be less than 1. Hence, in order to enhance the competitive edge of Indian iron & steel industry, an efficient alumina rich ore removal technology is essential. The present work aims to establish the feasibility of Infrared Thermography for the same. The work is directed towards active excitation of iron ores using infrared lamp followed by recording thermographic image which clearly distinguishes high iron & rich alumina content ores. The image is analyzed by software which on the basis of a threshold temperature rejects the high alumina content ores as they reached lower temperature than high iron content ore during the same period of excitation. The present system can be automated for continuous online monitoring while the ore runs on conveyer belt. According to one estimate, if alumina content in the sinter is reduced to less than 2% will improve the RDI (Reduction-degradation index) by at least six points, lower blast furnace coke rate by 14kg per tonne of hot metal & increase its productivity by about 30% under Indian operating conditions

Mechanochemical decomposition of Gd3Fe5O12 garnet phase

Gadolinium iron garnet was milled in a high energy ball mill to study its magnetic properties in the nanocrystalline regime. XRD reveals the decomposition of the garnet phase into Gd-orthoferrite and Gd2O3 on milling. The variation of saturation magnetization and coercivity with milling is attributed to a possible shift in the compensation temperature on grain size reduction and an increase in the orthoferrite content. The Mössbauer spectrum at 16 K is characteristic of the magnetically ordered state corresponding to GdIG, GdFeO3 and α-Fe2O3 whereas at room temperature it is a superparamagnetic doublet

Mechanochemical decomposition of Gd<SUB>3</SUB>Fe<SUB>5</SUB>O<SUB>12</SUB> garnet phase

Gadolinium iron garnet was milled in a high energy ball mill to study its magnetic properties in the nanocrystalline regime. XRD reveals the decomposition of the garnet phase into Gd-orthoferrite and Gd2O3 on milling. The variation of saturation magnetization and coercivity with milling is attributed to a possible shift in the compensation temperature on grain size reduction and an increase in the orthoferrite content. The M&#214;ssbauer spectrum at 16 K is characteristic of the magnetically ordered state corresponding to GdIG, GdFeO3 and a-Fe2O3 whereas at room temperature it is a superparamagnetic doublet