Thermal conductivity of fused quartz at various temperatures

Thermal conductivity of fused quartz at various temperatures

Junjie Chen

Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: [e-mail], Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China

Fused quartz, fused silica or quartz glass is a glass consisting of almost pure silica in amorphous form. This differs from all other commercial glasses in which other ingredients are added which change the glasses' optical and physical properties, such as lowering the melt temperature. Fused quartz, therefore, has high working and melting temperatures, making it less desirable for most common applications. The terms fused quartz and fused silica are used interchangeably, but can refer to different manufacturing techniques, resulting in different trace impurities. However fused quartz, being in the glassy state, has quite different physical properties compared to crystalline quartz. Due to its physical properties, fused quartz finds specialty uses in semiconductor fabrication and laboratory equipment, for instance. Compared to other common glasses, the optical transmission of pure silica extends well into the ultraviolet and infrared wavelengths, so is used to make lenses and other optics for these wavelengths. Depending on manufacturing processes, impurities will restrict the optical transmission, resulting in commercial grades of fused quartz optimized for use in the infrared, or in the ultraviolet. The low coefficient of thermal expansion of fused quartz makes it a useful material for precision mirror substrates. Fused quartz is produced by fusing high-purity silica sand, which consists of quartz crystals.

Thermodynamic temperature (degrees kelvin), Thermal conductivity (watts per meter-kelvin)

123        0.84

173        1.05

223        1.2

273        1.32

323        1.41

373        1.48

100        0.52

200        1.13

223        1.23

293        1.4

323        1.42

373        1.5

400        1.53

500        1.59

600        1.73

700        1.92

800        2.17

900        2.48

1000             2.87

1100             3.34

1200             4

1300             4.8

1400             6.18