Melting conditions for quartz glass of high purity and structural perfection

2012 ◽  
Vol 69 (7-8) ◽  
pp. 224-228 ◽  
Author(s):  
R. Sh. Nasyrov ◽  
S. A. Popov
Keyword(s):  
Quartz Glass ◽  
High Purity ◽  
Structural Perfection ◽  
Melting Conditions

Ultra-Precision Shaping and Ultra-Smooth Polishing Investigation of High-Purity Quartz Glass in Nanoparticle Colloid Jet Machining

2012 ◽  
Vol 426 ◽  
pp. 396-399 ◽  
Author(s):  
Xiao Zong Song ◽  
Yong Zhang ◽  
Fei Hu Zhang
Keyword(s):  
Quartz Glass ◽  
High Purity ◽  
Glass Surface ◽  
Morphological Characteristics ◽  
Surface Profile ◽  
Processing Technique ◽  
Surface Shape ◽  
Before And After ◽  
Ultra Precision ◽  
Nanoparticle Colloid

In this paper, ultra-precision shaping and ultra-smooth polishing investigations have been done upon a high-purity quartz glass substrate with an aspheric surface in nanoparticle colloid jet machining, which is an ultra smooth surface processing technique utilizing surface chemical reaction between work surface atoms and nanoparticles to remove the uppermost surface atoms. The shaping and polishing characters of high-purity quartz glass in nanoparticle colloid jet machining has been researched. The surface profile of the high-purity quartz glass workpiece before and after shaping has been measured by surface profilometer. And the surface microscopic morphological characteristics of high-purity quartz glass surface polished by nanoparticle colloid jet machining have been observed by atomic force microscopy (AFM). The measurement results indicate that nanoparticle colloid jet machining has good shaping ability for surface shape correction in ultra-precision machining. And the AFM observation results show that the roughness of the high-purity quartz glass surface has been reduced from 1.919 nm RMS to 0.784 nm RMS by nanoparticle colloid jet machining.

Filter elements from high-purity quartz glass for flow-through equipment for concentration of silica-containing feedstock

2006 ◽  
Vol 63 (11-12) ◽  
pp. 362-363 ◽  
Author(s):  
B. L. Krasnyi ◽  
V. P. Tarasovskii ◽  
T. S. Marinina ◽  
A. I. Goptar’
Keyword(s):  
Quartz Glass ◽  
High Purity ◽  
Flow Through

Growth by solid phase recrystallization and assessment of large ZnSe crystals of high purity and structural perfection

1996 ◽  
Vol 159 (1-4) ◽  
pp. 156-160 ◽  
Author(s):  
R. Triboulet ◽  
J.O. Ndap ◽  
A. Tromson-Carli ◽  
P. Lemasson ◽  
C. Morhain ◽  
...  
Keyword(s):  
High Purity ◽  
Solid Phase ◽  
Structural Perfection ◽  
Phase Recrystallization

scholarly journals Dynamical X-ray diffraction imaging of voids in dislocation-free high-purity germanium single crystals

2020 ◽  
Vol 53 (4) ◽  
pp. 880-884 ◽  
Author(s):  
Kevin-P. Gradwohl ◽  
Andreas N. Danilewsky ◽  
Melissa Roder ◽  
Martin Schmidbauer ◽  
József Janicskó-Csáthy ◽  
...  
Keyword(s):  
Single Crystals ◽  
High Purity ◽  
Direct Evidence ◽  
X Ray Diffraction ◽  
Structural Perfection ◽  
X Ray ◽  
High Purity Germanium ◽  
High Structural Perfection ◽  
Diffraction Imaging ◽  
General Method

White-beam X-ray topography has been performed to provide direct evidence of micro-voids in dislocation-free high-purity germanium single crystals. The voids are visible because of a dynamical diffraction contrast. It is shown that voids occur only in dislocation-free parts of the crystal and do not show up in regions with homogeneous and moderate dislocation density. It is further suggested that the voids originate from clustering of vacancies during the growth process. A general method is proposed to verify the presence of voids for any crystalline material of high structural perfection.

Modernization of Production of High-Purity Quartz Groats from Natural Quartz

2012 ◽  
Vol 560-561 ◽  
pp. 525-528
Author(s):  
Roudolf S. Nasyrov
Keyword(s):  
Physicochemical Properties ◽  
Quartz Glass ◽  
High Purity ◽  
Raw Materials ◽  
Optical Characteristics ◽  
Vacuum Melting ◽  
Natural Quartz ◽  
Formation Conditions ◽  
Natural And Synthetic

This Based on analysis of the formation conditions of quartz of different fields, their structural and physicochemical properties of the known technologies of quartz grit were proposed a new operations to perform certain operations, cleaning the quartz grit. A comparison of the optical characteristics of quartz glass, melted in different ways vacuum melting of natural and synthetic raw materials has been carried out.

scholarly journals Gravitational Waves Detected with Help from High-Purity Quartz Glass

2016 ◽  
Vol 11 (3) ◽  
pp. 32-35
Author(s):  
Ralf Takke ◽  
Klaus Rollmann ◽  
Jörg Wetterau
Keyword(s):  
Gravitational Waves ◽  
Quartz Glass ◽  
High Purity

Mechanisms of light absorption in gamma-irradiated blanks for optical fibers based on high-purity quartz glass

2005 ◽  
Vol 31 (6) ◽  
pp. 498-499 ◽  
Author(s):  
M. O. Zabezhailov ◽  
A. L. Tomashuk ◽  
I. V. Nikolin ◽  
V. G. Plotnichenko ◽  
E. B. Kryukova ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Quartz Glass ◽  
High Purity ◽  
Light Absorption ◽  
Gamma Irradiated

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

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