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The interdiffusion of HfC and TiC during hot pressing was investigated using concentration profiles obtained via EDS in a SEM. The results were interpreted using the Boltzmann–Matano method and the integrals and derivatives were determined via numerical means. The microstructural evolution of two materials with different HfC/TiC is then explained in terms of the rate of material movement.
Zircon is notorious for its chemical inertness. Extreme processing conditions such as alkaline fusion (NaOH at 600°C or Na 2 CO 3 at 1200°C) are used to extract the zirconium values from the mineral. In this study zircon was treated with ammonium acid fluoride (NH 4 F·1.5HF) by means of microwave assisted digestion. Reaction times ranged from 15 to 260min at temperatures between...
This paper describes the use of vibration analysis as the means of a predictive and preventive maintenance tool. From the data gathered by means of vibration analysis a mathematical model was developed using reliability engineering tools such as the Weibull distribution. From this it can be seen that by trending data that is periodically recorded an accurate indication of equipment failure can be...
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