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The Preparation of High-Purity Boron by Hot-Wire Techniques
1960Techniques are described for preparing massive, 99.9+% pure boron in 100-g quantities by hydrogen reduction of boron tribromide vapor on tantalum filaments at 1450°C. Deposition rates up to 9 g/hr, with better than 90% recovery of boron from the tribromide, were obtained. Under optimum conditions, the impurity levels in parts per million in the product
C. F. Powell, C. J. Ish, J. M. Blocher
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Comparison of laser cladding with powder and hot and cold wire techniques
ICALEO 2006: 25th International Congress on Laser Materials Processing and Laser Microfabrication, 2006Laser cladding with various methods have been utilized for some years with increasing quantity. Powder has been traditional type of consumable, but some usage of wires has been reported as well. There are also a number of cladding reports with preheated wire deposition. The aim has been to increase the low productivity of laser cladding. The preheating
Janne Nurminen +3 more
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Deposition of device quality a-Si:H films with the hot-wire technique
Journal of Non-Crystalline Solids, 1993Abstract High quality hydrogenated amorphous silicon (a-Si:H) films have been deposited using thermal decomposition of silane (SiH 4 ) at a heated tungsten filament. Deposition rates up to 8 A/s were achieved for device quality material. The stability of the films deposited at substrate temperatures above 400 °C has been observed to be superior to ...
P. Papadopulos +4 more
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Development of techniques for making hot-wire probes and a portable hot-wire calibration device
2008A technqique in making the hot-wire/cold wire probe in-house is presented. The techniques leads to a great saving in cost and more importantly a great advances in turbulent research in NTU for both velocity and temperature measurements.
Chua, Leok Poh, Liu, Chang Yu
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Experimental comparison of two hot-wire techniques in supersonic flow
AIAA Journal, 1989The performance of two constant-temperature normal hot-wire techniques for resolution of turbulent mass flux and local stagnation temperature in a supersonic flow is examined. The first technique used a single wire and the rapid scanning of multiple overheat ratios.
D. A. Walker, W. F. Ng, M. D. Walker
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Applied Surface Science, 2001
Abstract This work analyse mainly the dissociation mechanism of the gas during the hot wire (HW) and hot wire plasma-assisted (HWPA) processes used to produce hydrogenated carbon films and silicon-carbide, using ethylene and silane as gas sources. The results show that ethylene is better decomposed by plasma-enhanced chemical vapour deposition (PECVD)
I Ferreira +4 more
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Abstract This work analyse mainly the dissociation mechanism of the gas during the hot wire (HW) and hot wire plasma-assisted (HWPA) processes used to produce hydrogenated carbon films and silicon-carbide, using ethylene and silane as gas sources. The results show that ethylene is better decomposed by plasma-enhanced chemical vapour deposition (PECVD)
I Ferreira +4 more
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Measurement of Swirling Flow Field Using the Single Slanted Hot-Wire Technique
Volume 1: Aircraft Engine; Turbomachinery, 1985This paper presents the use of a single slanted hot wire to measure the three velocity components of a swirling flow field. In its usage, the hot wire probe has been calibrated in a subsonic air jet for both speed and direction. It was then used to measure the swirling flow field associated with the presence of an inlet model.
H.W. Shin, Z.A. Hu
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Measurement of the thermal conductivity of frost by a transient hot-wire technique
Journal of Geophysical Research, 1970A transient method of measuring thermal conductivity is described, along with the results of some experiments with frost. The method utilizes a fine wire thermojunction, which is imbedded in the frost and heated at a constant rate with a radio frequency current. The transient temperature response of the wire is then obtained by electronic filtering and
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Deposition of device quality, low H content a-Si:H by the hot wire technique
Journal of Non-Crystalline Solids, 1991ABSTRACTWe report measurements of the Urbach edge, optical bandgap, and ambipolar diffusion length on a series of hydrogenated amorphous silicon (a-Si:H) films deposited by hot-wire-assisted chemical vapor deposition (HW). We compare the properties of these films to those of a series of a-Si:H films deposited by the traditional radio frequency (rf ...
A. H. Mahan +3 more
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A review of the hot-wire technique in 2-D compressible flows
Progress in Aerospace Sciences, 1994Abstract In this paper the use of hot-wire anemometers for obtaining turbulence data in two-dimensional compressible flows has been reviewed. Based on the existing experimental results, the methods of extracting different turbulent quantities from the output signal of the hot-wire anemometer in a given flow environment have been described and ...
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