0000047513 00000 n This value changes little over a wide range of frequencies. 0000056170 00000 n The purities of fused quartz and fused silica are outstandingly high. Surface condition is very important. 0000005208 00000 n < Transmission can be influenced by material purity and the method of manufacture.

0000053113 00000 n We offer many different grades of fused silica to support various product applications. 0000054813 00000 n

In this work, scratching on fused silica with a conical indenter and a Berkovich indenter was investigated by finite element analysis (FEA). 0000000016 00000 n 0000001652 00000 n 0000001985 00000 n All rights reserved.ScienceDirect ® is a registered trademark of Elsevier B.V. Unfortunately, the strength observed in practice is always far below this value. Quartz glass is sensitive to all alkali and alkaline-earth compounds because even slight traces of them hasten devitrification at high temperatures. The higher viscosity results in an increased maximum use temperature as well as helping to inhibit devitrification.

Fused Silica, SiO2. Fused silica is an entirely synthetic material crafted from silicon gas or silica sand (noncrystalline) and has good ultraviolet (UV) performance, making it ideal for applications such as UV transmitting optics. Purity is mostly determined by the raw material, the manufacturing method and subsequent handling procedures.
0000054631 00000 n

HPFS® Fused Silica Standard Grade HPFS® Standard Grade, Corning code 7980, is a high purity synthetic amorphous silicon dioxide manufactured by flame hydrolysis.

0000012585 00000 n Hardness of fused silica was determined to be varied within a relatively large range (e.g.

0000074093 00000 n %PDF-1.5 %���� 0 0000001921 00000 n

It is always advisable to remove fingerprints, which contain traces of alkalis, from quartz glass with alcohol before heating.One of the most attractive features of quartz glass is its very low thermal coefficient of expansion (CTE). With the effects of elastic recovery taken into account, the apparent friction coefficient predicted by these analytical models is consistent with FEA. Synthetic fused silica from Heraeus contains total metallic contamination below 1ppm. Depending on transmission range there are UV and IR Fused Silica grades: the useful range of UV grade is 0.17 - 2 µm and of IR grade is 0.23 - 3.5 µm. 0000021093 00000 n
0000014773 00000 n 0000000735 00000 n Fused silica is an amorphous grade of silica known for its low thermal expansion and … 0000070633 00000 n 0000027921 00000 n

Hence, unlike typical conductors such as metals, the resistivity decreases with increasing temperature.The dielectric constant of quartz glass has a value of about 4 which is significantly lower than that of other glasses. Elastic recovery of fused silica under scratching has significant effects on its hardness and friction coefficient. h�lQ_HSq�~�{ݜ�����)���Sk살��9���97F�a�AB�K0�(�Bs֐-!2�f$!$Rd]ȁ�zH���"Ԟ�$�{UԠ���q��@t4P��С This is because these tests in reality often turn out to be just comparisons of surface quality resulting from sample preparation, small differences in which easily overwhelm any differences in intrinsic strength.The optical properties of fused silica offer striking opportunities for research and industry: the broad transparent transmission range covers the complete visible spectrum and extends far into the infrared and ultraviolet regions.

The reason for the low dielectric constant is, once again, the lack of highly charged mobile ions but it also results from the stiffness of the silicon-oxygen network which imparts a very low polarizability to the structure.Because it has very low absorption down into the vacuum ultraviolet spectral range (the cutoff is at about 160 nm for a 1 mm thickness), synthetic fused silica is used for lenses in high-energy laser applications and as an envelope material for ultraviolet light sources such as excimer or deuterium lamps.

0000034101 00000 n

Fused silica with known elastic properties (elastic modulus 73.4 GPa and Poisson's ratio 0.16) and not exhibiting time-dependent properties were used for indentation test.

HPFS® Fused Silica glasses are known throughout the industry for their consistent, repeatable performance.

0000002089 00000 n The material has high homogenity and good transmission in the ultraviolet, visible and infrared spectral regions. .

0000047416 00000 n For example, machined surfaces tend to be weaker than fire polished ones. 3009 0 obj <> endobj It is synthesized using an electric arc at 2,000°C. Because of stress concentration on surface flaws, failure most always occurs in tension rather than compression.In other words: „reliablility depends on the chance“.This could also be stated as the probability that the piece will experience a mechanical stress greater than the strength of any existing flaws. It is the surface quality in combination with design considerations and chemical effects of the atmosphere (water vapor in particular) that ultimately control the strength and reliability of a finished piece of quartz glass. Fused silica glass is a very low thermal expansion material, and so is extremely thermal shock resistant.


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