نتایج جستجو برای: si3n4 nanopowder
تعداد نتایج: 2129 فیلتر نتایج به سال:
The objective of this work is to evaluate the potential of microwave techniques for detecting, classifying, and determining the dimensions of inclusions and surface cracks in structural ceramics such as Si3N4. Experimental results that show the feasibility of detecting various types of inclusions and voids in Si3N4 have been obtained, and these results are reviewed. In addition, the question of...
In this paper, RF MEMS Capacitive Switches for two different dielectrics hafnium oxide (HfO2) and silicon nitride (Si3N4) are presented. The switches have been characterized and compared in terms of RF performance. The major impact of the change from Si3N4 to HfO2 having dielectric constant 20 is the reduction in overall dimension of the switch; capacitive area is reduced by 66% leading to over...
InGaAsP/InP multiple quantum wells with quantum well intermixing (QWI) have been prepared by Impurity-Free Vacancy Disordering (IFVD). The luminescent characteristics were investigated using photoluminescence (PL) and photoreflectance (PR), from which the band gap blueshift was observed. Si3N4, SiO2 and SOG (spin on glass) were used for the dielectric layer to enhance intermixing from the outdi...
Nanosized Powders are known to have very useful applications in the areas of medical, structural, chemical and other various fields because of their enhanced physical, optical, and magnetic properties. Several Synthesis methods have been developed for the production of nanopowders. This paper will discuss different methods used for the production of nanosized powders and their advantages and di...
Poor thermal shock and resistance to crack propagation have had a negative influence on the acceptance of ceramics for components in air breathing engine applications. In comparison with their metallic counterparts, they are less predictable and there is limited historical in-use data available. They have therefore been considered primarily for non-load bearing applications such as flaps and se...
In the past few decades, gate insulators with a high dielectric constant (high-k dielectric) enabling a physically thick but dielectrically thin insulating layer, have been used to replace traditional SiOx insulator and to ensure continuous downscaling of Si-based transistor technology. However, due to the non-silicon derivative natures of the high-k metal oxides, transport properties in these ...
While the reciprocity between bioceramics and living cells is complex, it is principally governed by the implant's surface chemistry. Consequently, a deeper understanding of the chemical interactions of bioceramics with living tissue could ultimately lead to new therapeutic strategies. However, the physical and chemical principles that govern these interactions remain unclear. The intricacies o...
در این پژوهش، چهار نمونه سرامیکی فوق دما بالای پایه دی‌بورید تیتانیم یعنی نمونه‌های بدون افزودنی، دارای نیترید سیلیسیم (5 درصد وزنی)، دارای کاربید سیلیسیم (20 درصد حجمی) و دارای هر دو افزودنی نیترید و کاربید سیلیسیم به روش تفجوشی پلاسمای جرقه‌ای (SPS) در دمای 1900 درجه سانتی‌گراد به مدت 7 دقیقه با فشار 40 مگاپاسکال ساخته شد. ریزساختار کامپوزیت‌های پایه TiB2 به خاطر افزودن SiC و Si3N4 تحت تاثیر ...
Ultra-long, single crystal, α-Si3N4 nanowires sheathed with amorphous silicon oxide were synthesised by an improved, simplified solid-liquid-solid (SLS) method at 1150 °C without using flowing gases (N2, CH4, Ar, NH3, etc.). Phases, chemical composition, and structural characterisation using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron micr...
PURPOSE In this work we investigated the suitability of electroconductive silicon nitride/titanium nitride composite for biomedical implantable devices with particular attention on the processing route that allows the net-shaping of complex components by electrical discharge machining (EDM). METHODS The composite, constituted mainly of a beta-Si3N4, dispersed TiN grains and a glassy grain bou...
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