SOME PROPERTIES OF FUSED QUARTZ <scp>and</scp> OTHER FORMS OF SILICON‐DIOXIDE<sup>1</sup>

Watson, H. H.

doi:10.1111/j.1151-2916.1926.tb17197.x

Cited by 11 publications

(4 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…Fused silica has technological importance due to its interesting properties such as high thermal shock resistance, low thermal expansion coefficient, low density, and low thermal conductivity combined with low dielectric behavior. [1][2][3] In addition to properties, it also possesses stable structural and electromagnetic properties even at very high temperature. 4,5 These properties make fused silica the candidate material particularly for high temperature aerospace applications like thermal protection system in space vehicle and radome material in supersonic missiles.…”

Section: Introductionmentioning

confidence: 99%

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Reliability studies of gelcast fused silica between organic and inorganic binder systems

Manivannan

Srikanth

Kumar

et al. 2017

Int J Applied Ceramic Tech

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Fused silica ceramics was prepared by using conventional organic binder, mathacrylamide‐N,N′‐methylenebisacrylamide (MAM‐MBAM) system by gelcasting process. Mechanical properties of green bodies were studied as a function of solid loading varying from 60 to 72 vol%. After evaluating the green body mechanical properties, the samples were densified at different sintering temperature from 1200 to 1450°C with definite intervals of 50°C and subjected to flexural strength analysis. Variation in flexural strength with sintering temperature was observed and correlated with the quantity of devitrification of fused silica during sintering. Quantification of devitrified cristobalite was carried out by using 20 wt% rutile (TiO2) as an internal standard by X‐ray diffraction. It was found that, as the cristobalite content increased, flexural strength decreased. Reliability studies were carried out for the samples having maximum flexural strength with and without crystalline content. Reliability studies have shown that for this organic binder system the sample sintered at 1300°C is crystalline free and most reliable product. The mechanical properties and reliability of this product processed with organic binder are compared with inorganic binder system. Results indicate that the sample fabricated using inorganic binder system is exhibiting high Weibull modulus and thus better reliability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability studies of gelcast fused silica between organic and inorganic binder systems

Manivannan

Srikanth

Kumar

et al. 2017

Int J Applied Ceramic Tech

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“…Fused silica has interesting properties such as high thermal shock resistance, low thermal expansion coefficient, low density, and low thermal conductivity combined with low and stable dielectric behavior . Due to these properties, fused silica could find a wide range of strategic and industrial applications such as electromagnetic transparent materials, thermal protection systems as refractory materials in metal processing and kiln furniture etc .…”

Section: Introductionmentioning

confidence: 99%

Aqueous Gelcasting of Fused Silica Using Colloidal Silica Binder

2013

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An aqueous-based gelcasting of fused silica ceramics by using colloidal silica binder was developed. Fused silica slurries having different volume percentage of solid loading from 63 to 74 vol% in colloidal silica were made and the rheological properties were evaluated. It was found that the slurry with 73 vol % of solid loading with viscosity 0.70 Pa.s is suitable for this gelcasting system. The influence of solid loading on physical and mechanical properties of gelcast green and sintered bodies has been studied. The fabricated green body by using colloidal silica binder exhibited a flexural strength of 9 MPa and 88% of theoretical density with 2.2% of drying shrinkage while the sintered sample exhibited flexural strength of 60 MPa and 95% of theoretical density with 4.3% of sintering shrinkage. It was observed that, the nano silica particles from the colloidal silica binder is filling the interstitial positions in the consolidated fused silica green body and enhancing physical and mechanical properties. J ournalbehavior of the silica slurry was studied by measuring storage modulus (G′) in the oscillatory mode at a frequency of 1 Hz and at a constant strain of 0.2%.

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“…Three reasons explain the appearance of the grain boundary and the oozing of the metallic impurities: (1) the crystallization of the amorphous fused quartz taking place in the first heating produces the grain boundaries (cf.,Fig. 2-12, a and b), (2) the α→β phase transition of the crystalline quartz occurs at 573 o C (in the succeeding heating),[110][111][112][113] resulting in the change of the quartz crystals in cell dimension and volume, thus thickens the grain boundaries; (3) the melting of the metallic impurities, e.g., Zn (melting point, 420 o C),[97] Al (melting point, 660 o C) and Cu (melting point, 1083 o C). Though the impurity level may change from supplier to supplier, Al and Cu exist in all the quartz tubes (cf., Table 2-4).…”

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confidence: 99%

Growth mechanism of silicon nanowires from nickel-coated silicon wafer

Li¹

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Crystalline silicon (Si) nanowires are important building blocks in devices of photonics, quantum-dots, optoelectronics, and energy. Thermal annealing of metalcovered Si wafers gives rise to clean Si nanowires without metallic catalyst at the tip. The process does not need flammable or toxic gases. However, the growth mechanism is yet elucidated. This project grows Si nanowires by adopting the thermal annealing method: nickel (Ni) is sputtered on Si wafers as catalyst and thereafter a layer of carbon is sputtered to protect Si nanowires from oxidation during thermal annealing. Careful studies via transmission electron microscopy and selected area electron diffraction patterns elucidate the growth process and the relationship between the seeding Ni particle and the grown Si nanowire. The seeding Ni particles are embedded in the Ni-Si-O nanoclusters that are connected with the grown Si nanowires at the end of the nanowire growth. The growth orientation of Ni-seeded Si nanowires is not dictated by surface energy of the various nanocrystal planes, but follows specific structure sensitive principle with the seeding Ni nanoparticles to minimize the mismatch in lattice spacing and dihedral angle at the wire/particle interface. It is inferred that the growth orientation of Si nanowires is determined by the ordered planes of the Ni catalyst particle at the wire/particle interface. The various morphologies of the nanowires are controlled by the diameter and vibration of the Ni-Si-O droplet, the distribution of the Ni-Si, Ni-Si-O y (y≈1) and Ni-Si-O x (x≈2) phases, and the supersaturated content in the Ni-Si-O droplet. III ACKNOWLEDGEMENT I wish to deliver my most sincere and deepest gratitude to my supervisor Prof. Sam Zhang Shanyong for his effective academic advisory, continuous guidance and endless patience. Without his encouragement and care, I can't finish this tough work. I owe sincere thanks to Ms. Guo Jun and Mr. Kong Junhua from School of Material Science Engineering for their characterization assistance and constructive suggestions. Sincere thanks to all the researchers in Prof. Sam Zhang's group for their helpful discussions, suggestions and timely assistance.

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SOME PROPERTIES OF FUSED QUARTZ and OTHER FORMS OF SILICON‐DIOXIDE¹

Abstract: A cornpilatiori of data on the physical properties of silicon-dioxide.

Cited by 11 publications

References 1 publication

Reliability studies of gelcast fused silica between organic and inorganic binder systems

Reliability studies of gelcast fused silica between organic and inorganic binder systems

Aqueous Gelcasting of Fused Silica Using Colloidal Silica Binder

Growth mechanism of silicon nanowires from nickel-coated silicon wafer

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SOME PROPERTIES OF FUSED QUARTZ and OTHER FORMS OF SILICON‐DIOXIDE1

Abstract: A cornpilatiori of data on the physical properties of silicon-dioxide.

Cited by 11 publications

References 1 publication

Reliability studies of gelcast fused silica between organic and inorganic binder systems

Reliability studies of gelcast fused silica between organic and inorganic binder systems

Aqueous Gelcasting of Fused Silica Using Colloidal Silica Binder

Growth mechanism of silicon nanowires from nickel-coated silicon wafer

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SOME PROPERTIES OF FUSED QUARTZ and OTHER FORMS OF SILICON‐DIOXIDE¹