Synthesis of Commercial-Scale Tungsten Carbide-Cobalt (WC/Co) Nanocomposite Using Aqueous Solutions of Tungsten (W), Cobalt (Co), and Carbon (C) Precursors

作者: Yang, Jiangao ; Peng, Fangcai ; Tan, Xinglong ; Xiao, T. Danny ; Peng, Shigao ; Dai, Yu ; Yi, Maozhong

This paper reports the chem. synthesis of tungsten carbide/cobalt (WC/Co) nanocomposite powders via a unique chem. processing technique, involving the using of all water soluble solution of W-, Co- and C-precursors.In the actual synthesis, large quantities of com.-scale WC-Co nanocomposite powders are made by an unique combination of converting a molecularly mixed W-, Co-, and C-containing solutions into a complex inorganic polymeric powder precursor, conversion of the inorganic polymeric precursor powder into a W-Co-C-O containing powder intermediates using a belt furnace with temperature at about 500°C - 600°C in an inert atm., followed by carburization in a rotary furnace at temperature less than 1000°C in nitrogen.Liquid phase sintering technique is used to consolidate the WC/Co nanocomposite powder into sintered bulk parts.The sintered parts have excellent hardness in excess of 93 HRA, with WC grains in the order of 200 - 300 nm, while Co phase is uniformly distributed on the grain boundaries of the WC nanoparticles.We also report the presence of cobalt Co precipitates inside tungsten carbide WC nanograins in the composites of the consolidated bulk parts.EDS is used to identify the presence of these precipitates and micro-micro-diffraction technique is employed to determine the nature of these precipitates

2013-05-01·2013 IEEE 63rd Electronic Components and Technology Conference

3D IPAC — A new passives and actives concept for ultra-miniaturized electronic and bioelectronic functional modules

作者: Uei-Ming Jow ; Dibyajat Mishra ; Himani Sharma ; Maysam Ghovanloo ; T. Danny Xiao ; K. P. Murali ; P. Markondeya Raj ; Rao Tummala ; Saumya Gandhi ; Jinxiang Dai

This paper describes an innovative 3D IPAC (Integrated Passive and Active Components) concept for ultra-miniaturized and highly-functional sub-systems, going beyond discrete passives and Integrated Passive Devices (IPDs).The 3D IPAC concept consists of an ultra-thin 3D structure made of low loss and ultra-thin glass substrates with small-diameter through-vias, and ultra-thin active devices and thin or thick passive films or thin discrete passives on both sides.The first part of the paper describes the benefits of the 3D IPAC concept.The second part of the paper describes a wireless power telemetry module for a bioelectronic system application, and provides proof-of-concept demonstrations for the thin film passive components as a building block in the 3D IPAC telemetry module.

2008-12-01·Journal of Thermal Spray Technology

Innovation of Ultrafine Structured Alloy Coatings Having Superior Mechanical Properties and High Temperature Corrosion Resistance

作者: D.W. Gandy ; G.J. Frederick ; X.Q. Ma

High temperature protection requires full coating d., high adhesion, minor oxide inclusions, and preferably fine grains, which is not achievable in most thermal spray processes.High velocity oxygen fuel (HVOF) thermal spray process has been applied extensively for making such coatings with the highest d. and adhesion strength, but the existence of not melted or partially melted particles are usually observed in the HVOF coatings because of relatively low flame temperature and short particle resident time in the process.This work has investigated the development of an innovative HVOF process using a liquid state suspension/slurry containing small alloy powders.The advantages of using small particles in a HVOF process include uniform coating, less defective microstructure, higher cohesion and adhesion, full d., lower internal stress, and higher deposition efficiency.Process investigations have proven the benefits of making alloy coatings with full d. and high bond strength attributing to increased melting of the small particles and the very high kinetic energy of particles striking on the substrate.High temperature oxidation and hot corrosion tests at 800 °C have demonstrated that the alloy coatings made by novel LS-HVOF process have superior properties to conventional counterpart coatings in terms of oxidation rates and corrosion penetration depths.

100 项与 Inframat Corp. 相关的药物交易

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100 项与 Inframat Corp. 相关的转化医学

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