Quartz piece of paper
Quartz piece, usually by quartz smelting and cutting had become,
the silica content of *9.*9% above. Hardness of mo type seven
levels, good resistance to high temperature and thermal expansion
coefficient is low, cooling.under and electrical insulating
performance is good, etc. Usually colorless transparent class,
visible through rate above *5%.
A, optical properties
Quartz piece of optical performance has its unique, can be either
through far ultraviolet ray, is all through the ultraviolet
material addition, and through the near infrared spectrum can be
visible light. Due to high temperature resistant quartz glass,
thermal expansion coefficient is tiny, chemical stability, bubbles,
stripe, uniformity and birefringence and and general optical glass
to rival, so it is in all kinds of bad situation work with high
stability coefficient of optical an optical materials. According to
the optical properties can be divided into three categories: 1. Far
ultraviolet quartz glass JGS1 in ultraviolet, and within the scope
of visible spectrum transparent; In ******0 nm band range without
absorption belt; In ********0 nm band within the area with strong
absorption; The luminous, irradiation stability. 2. Ultraviolet
quartz glass JGS2 in ultraviolet, and within the scope of visible
spectrum transparent; In ******0 nm band range without absorption
belt; In ********0 nm band within the area with strong absorption;
The luminous, irradiation stability. 3. Infrared optical quartz
glass JGS3 in the visible and infrared spectrum range transparent;
In ********0 nm band range with no obvious absorption. And ordinary
Portland than glass, clear quartz glass in the whole wavelength
head good through the performance. In the infrared spectrum than
common glass area through; In the visible region, quartz glass of
through rate is also high. In the ultraviolet spectrum area
especially in short wave ultraviolet area, spectrum than other
glass through better spectrum through rate by three factors:
reflection, scattering and absorption. Quartz glass reflection is
commonly 8%, ultraviolet area a few bigger, infrared area small. So
the quartz glass through rate generally no more than *2%. Quartz
glass scattering is small, can generally ignored. Spectrum
absorption and quartz glass impurity content and process have close
relations; In less than **0 meters of sodium through rate height,
the representative of the metal impurity content how many; **0 the
absorption of oxygen sodium m said how much of the structure; The
absorption of the visible spectrum is due to the existence of
transition metal ions to cause, the absorption of sodium ***0
meters of hydroxyl groups is absorption peaks, can be used to
calculate the hydroxyl content. Through performance spectrum
absorption spectrum with hydroxyl calculation: A GE calculation
formula of C = **0 / T * LOG*0 (Ta/Tb) mm*1 C: hydroxyl content (C,
PPM) T: thickness (mm) Ta: ***0 sodium m wavelength of through rate
Tb: ***0 sodium m wavelength of through rate B: China's national
standard calculation formula: C = *6.5 / d * LG*0 (Ia/I) mm*1 C:
hydroxyl content (PPM) d: thickness (cm) Ia: ***0 sodium mickey
line to the zero line distance (mm) I: ***0 sodium m absorption
peaks to zero line distance (mm) spectrum through rate: 1 mm
thickness) other thickness spectrum through rate can use formula: T
= (*-R) 2 e-at T: through rate R: SLR shoot loss. E: natural
logarithms base. T: thickness (cm) spectrum through rate nm
wavelength
Second, physical properties
Quartz piece is made using silicon dioxide special industrial
technology glass, it is a kind of very good base material. Quartz
piece with a series of excellent physical and chemical properties,
such as: 1, high temperature resistant. Quartz glass softening
point temperature of about ***0 ℃, ***0 ℃ in the long time of use,
the short time the highest use temperatures up to ***0 ℃. 2 and
corrosion. In addition to the hydrofluoric acid, quartz glass
almost no and other acid material produces chemical reaction, the
acid ability is the ceramic *0 times, stainless steel **0 times,
especially in high temperature chemical stability, is any other
engineering materials can match. 3, thermal stability. To adapt to
the glass thermal expansion coefficient of tiny, can withstand
severe temperature changes, the quartz glass heated to ***0 ℃ or
so, in room temperature water also won't crack. 4, pervious to
light good performance. Quartz piece in ultraviolet ray to infrared
spectral bands have into the good pervious to light performance,
visible light transmittance of *3% or more, especially in
ultraviolet spectrum area, the biggest through rate can reach more
than *0.
application
Quartz piece is the formation of the high temperature melt because
of its high viscosity caused by the results. Used to make
semiconductors, electric light source device, half the
communication device, laser, optical instrument, laboratory
instruments, electrical equipment, medical equipment and resistance
to high temperature corrosion resistance of chemical equipment,
chemical, electronic, metallurgy, building materials and defense
industry etc, used widely. Jiangsu DongHaiXian quartz technology of
long production quartz piece of high precision and no bubble, the
surface is smooth, corrosion resistance, pervious to light quality
good, especially for treatment, electronic, chemical, war industry
and other optical instrument observation window
window.
