What are the properties of fused silica glass?

Properties of fused silica

Table of Contents

high chemical purity and resistance,
high softening temperature and thermal resistance,
low thermal expansion with high resistance to thermal shocks,
high transparency from the ultraviolet to the infrared spectral range,
high radiation resistance.

What is fused silica glass made of?

silicon dioxide
Fused silica is a noncrystalline (glass) form of silicon dioxide (quartz, sand). Typical of glasses, it lacks long range order in its atomic structure. It’s highly cross linked three dimensional structure gives rise to it’s high use temperature and low thermal expansion coefficient.

Is fused silica fragile?

Fused Silica shows an almost perfect brittle-elastic behavior at temperatures lower than the transformation point. Fused Silica elasticity modulus is 73 GPa at 25ºC.

Is fused silica glass strong?

Benefits of Fused Silica Glass Some of the key benefits of using this glass material include: High chemical purity and resistance. High softening point and strong thermal resistance. Low thermal expansion and high thermal shock resistance.

What is silica glass?

glass is amorphous SiO2, or silica glass. (Quartz, which is present in sand, is a crystalline form of SiO2.) In amorphous SiO2 each silicon atom is bonded to four oxygen atoms, and each oxygen atom is bonded to two silicon atoms.

How is fused silica glass made?

Today flame fused quartz is manufactured on a large scale by a continuous process in which highly refined quartz sand is fed through a high temperature flame and deposited on the surface of a melt contained in a tank lined with refractory material.

Is fused silica amorphous or crystalline?

amorphous solid
Here, the word “fused” refers to a processing step: fused silica is nominally pure silica that has been melted and cooled to form a glassy, amorphous solid. Fused silica resembles other glasses in many ways; but it does not contain any additives.

Is fused silica glass?

Fused Silica is an entirely synthetic material, and is technically the purest glass. It has the highest temperature characteristics of any glass, and it often begins as pure silicon gas.

What is the difference between silica and silica glass?

The main difference between the two is that Fused Silica is composed of a non-crystalline silica glass, while Quartz is made from crystalline silica. This difference gives Fused Silica very high transmission in the UV spectrum compared to that of Quartz.

What is silicate glass used for?

They are used as optical glasses (specifically for crown glasses), e.g. for lenses, prisms, mirror substrates, optical filters and various other types of optical components. Some variants are used for making optical fibers; see the article on silica fibers.

What are the properties of fused silica?

A number of unique optical, mechanical and thermal properties of fused silica have made quartz glass an indispensable material in the fabrication of high-tech products. high radiation resistance.

What is the tensile strength of silica glass?

The various types of fused silica and fused quartz have nearly identical CTE’s and thus can be joined together with no added risk of thermally induced breakage. The theoretical tensile strength of silica glass is greater than 1 million psi. Unfortunately, the strength observed in practice is always far below this value.

What is the difference between fused quartz and fused silica?

The purities of fused quartz and fused silica are outstandingly high. Synthetic fused silica from Heraeus contains total metallic contamination below 1ppm. For fused quartz the amount is approximately 20 ppm and consists primarily of Al2O3 with much smaller amounts of alkalis, Fe 2 O 3, TiO 2, MgO and ZrO 2.

What is the OH content of fused quartz?

For fused quartz the amount is approximately 20 ppm and consists primarily of Al2O3 with much smaller amounts of alkalis, Fe 2 O 3, TiO 2, MgO and ZrO 2. In addition to metallic impurities, fused quartz and fused silica also contain water present as OH units. OH content influences the physical properties like attenuation and viscosity.