نتایج جستجو برای: hpht
تعداد نتایج: 146 فیلتر نتایج به سال:
High pressure high temperature (HPHT) nanodiamonds (NDs) represent extremely promising materials for construction of fluorescent nanoprobes and nanosensors. However, some properties of bare NDs limit their direct use in these applications: they precipitate in biological solutions, only a limited set of bio-orthogonal conjugation techniques is available and the accessible material is greatly pol...
This study investigates the effect of ZrB2 additions on microstructure, thermal stability, and thermo-mechanical wear resistance polycrystalline diamond. Following high-pressure high-temperature (HPHT) sintering, ZrB2-PCD material binder phase consisted cobalt-boride (Co2B B6Co23) phases. In-situ PXRD TEM vacuum annealing experiments observed that onset bulk graphitisation occurred above 1000 °...
Методом рентгенівської дифракції детально досліджено кристалічну структуру TiN, який поряд з cBN і продуктами реакційної взаємодії компонентів шихти (TiB2 та AlN) існує в композитах, отриманих HPHТ- спіканням (7, 7 ГПа, 1750–2300 °С) складу 60 об. % cBN, 35 TiN 5 Al. На основі рентге- ноструктурних розрахунків для кристалічної структури нітриду запропоновано модель модифікованої типу NaCl, яка ...
We present a facile method for the production of fluorescent diamond nanocrystals (DNCs) of different sizes and efficiently quantify the concentration of emitting defect color centers (DCCs) of each DNC size. We prepared the DNCs by ball-milling commercially available micrometer-sized synthetic (high pressure, high temperature (HPHT)) diamonds and then separated the as-produced DNCs by density ...
* Corresponding author – [email protected] Tel: 414-229-4126 Fax:414-229-6958 ABSTRACT Understanding the fundamental tribology associated with the cutting of rock under extremely high pressure and high temperature (HPHT) conditions are extremely important in mining and drilling operations. In this paper, a rock fragmentation process is simulated during mechanical cutting of rock using an explicit...
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