As a critical component of sapphire crystal growth furnaces, the reflective screen plays a key role in thermal management: it concentrates radiant heat from high-temperature sources through high infrared reflectivity, optimizing the temperature field distribution within the furnace and ensuring a stable temperature gradient at the crystal growth interface, while reducing heat loss to enhance thermal efficiency. This demands excellent high-temperature resistance, thermal shock resistance, and chemical stability from the reflective screen to ensure the uniformity and yield of sapphire crystal growth. Molybdenum sheet, with its high melting point, high infrared reflectivity, low thermal expansion coefficient, and superior chemical stability, is the ideal material for reflective screens.

The growth of sapphire crystals requires high temperatures and a clean environment, making molybdenum sheet, with its unique physicochemical properties, an indispensable key material in sapphire crystal growth furnaces.

Molybdenum sheet is characterized by a high melting point, good thermal stability, strong corrosion resistance, strong oxidation resistance, and excellent thermal and electrical conductivity, making it widely used in high-end fields such as aerospace, semiconductors, and energy chemicals.

Molybdenum sheet is a sheet-like material made from molybdenum metal through processes such as rolling. It is primarily used to produce reflective screens and covers in sapphire crystal growth furnaces, reflective screens, heating elements, and connectors in vacuum furnaces, as well as sputtering targets for plasma coating. It is a critical material in high-end manufacturing. The basic characteristics of molybdenum sheet are as follows:

Purple tungsten oxide, also known as tungsten purple oxide, is a typical tungsten oxide and an inorganic compound composed of 18 tungsten atoms and 49 oxygen atoms. It is an oxygen-vacancy tungsten oxide, appearing as a purple or blue-purple fine crystalline powder. Its English name is Purple Tungsten Oxide or Violet Tungsten Oxide (abbreviated as VTO or TVO), with a chemical formula of W₁₈O₄₉ or WO₂.₇₂ and a molecular weight of 227.36. Note: The oxidation state of tungsten in W₁₈O₄₉ is +5 or +6.

Blue tungsten oxide (BTO), a typical tungsten oxide (WO₃₋ₓ), also known as tungsten blue oxide, is a deep blue compound with mixed valence states of tungsten (VI) and tungsten (V). It is an inorganic compound composed of 20 tungsten atoms and 58 oxygen atoms, characterized as an oxygen-deficient/vacancy tungsten oxide. Its English name is Blue Tungsten Oxide (abbreviated as BTO), with a chemical formula of WO₂.₉₀ or W₂₀O₅₈. Note: Depending on calcination conditions, the phase composition of blue tungsten oxide varies, but it is primarily composed of WO₂.₉₀ or ammonium tungsten bronze (ATB) as the main phase.

Molybdenum sheet is a thin material processed from molybdenum metal, typically ranging from 0.01 to 2 millimeters in thickness. Due to its excellent high-temperature performance, corrosion resistance, and superior mechanical properties, it is widely used in electronics, aerospace, high-temperature furnaces, and chemical industries. Molybdenum sheet can be manufactured in rectangular, circular, or custom shapes, with widths ranging from 10 to 1,000 millimeters and lengths up to 2,000 millimeters or cut to specific requirements.

‌As a typical representative of refractory tungsten products, tungsten heater is deep-processed products made from pure tungsten wire or doped tungsten wire. Known as "tungsten heater" in English, they generally contain over 99.95% tungsten and have diameters ranging from ‌0.2–1.2 mm‌.

As a common impurity element in ammonium metatungstate (AMT), sodium primarily affects its physicochemical properties and application performance in the following ways:

Like ammonium paratungstate, ammonium metatungstate (AMT) is also an important tungstate, with the chemical formula (NH₄)₆H₂W₁₂O₄₀·xH₂O, where x typically ranges from 0 to 23. Common forms include (NH₄)₆H₂W₁₂O₄₀·4H₂O and (NH₄)₆H₂W₁₂O₄₀·H₂O.