Tungsten

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What Are the Main Properties of Tungsten Crucible? 44

The main properties of tungsten crucible include high melting point, high temperature resistance, excellent corrosion resistance, good thermal shock stability, and high strength and stability. 1. High melting point and high temperature resistance Tungsten has a high melting point of 3422°C, which is one of the highest melting points in nature, which allows crucibles to operate reliably in extremely high temperature environments. For example, during the growth of sapphire single crystals, the temperature in the furnace often exceeds 2000°C, and…

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What Is Tungsten Crucible? 41

Tungsten crucible is a kind of high-temperature container made of tungsten (W) or tungsten-based alloy as the main material, which is widely used in metallurgy, materials science, semiconductor, aerospace and other fields that require ultra-high temperature treatment. Tungsten is ideal for extreme high-temperature melting and chemical reactions due to its highest melting point of any known metal on the surface (approximately 3422 °C), excellent high-temperature strength, good thermal conductivity, and chemical inertness in vacuum and inert atmospheres. Using high-purity tungsten…

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Tungsten Sheet 42

Like tungsten bars, tungsten sheet is a typical product of the transition metal tungsten, sharing highly similar thermal, mechanical, chemical, and electrical properties, and is widely used in industries such as machinery and semiconductors. Tungsten sheet can be categorized into pure tungsten sheet and tungsten alloy sheet. The former is a thin sheet made from pure tungsten powder, while the latter is an alloy product with tungsten as the hard phase and metals like nickel and iron as the binding…

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Sodium Metatungstate 47

Like ammonium metatungstate (AMT), sodium metatungstate is an important compound of the transition metal tungsten. It is a polymeric metatungstate formed by acidifying an isotungstate solution, exhibiting excellent physicochemical properties and widely used in density separation studies in geology, soil science, and marine biology. Sodium metatungstate, also known as sodium metatungstate hydrate, polytungstate sodium, or sodium polytungstate, is a typical metatungstate composed of the transition metal tungsten, alkali metal sodium, non-metal oxygen, and hydrogen. It is a white crystal or…

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Yellow Tungstic Acid 44

As a typical tungstic acid, yellow tungstic acid generally refers to a transition metal compound with a 1:1 ratio of tungsten trioxide (WO?) to water (H?O). It consists of one tungsten atom, two hydrogen atoms, and four oxygen atoms, forming a pale yellow crystal or powder. It is a hydrated tungsten oxide, with the English name Yellow Tungstic Acid, a molecular formula of H?WO? or WO?·H?O, and a molecular weight of 249.86. Yellow tungstic acid appears as a pale orange-yellow…

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Tungsten Tetraboride 37

Like tungsten monoboride (BW), ditungsten boride (BW?), tungsten diboride (WB?), and ditungsten pentaboride (W?B?), tungsten tetraboride (WB?) is an inorganic compound composed of the transition metal tungsten (W) and the non-metal boron (B). It exhibits excellent mechanical and electrical properties, making it valuable for applications in machining and electrode preparation under extreme conditions. Due to varying ratios of tungsten to boron atoms, different tungsten borides have distinct physicochemical properties, production methods, and applications. Below is an overview of WB?’s basic…

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Molybdenum Acid 32

As an important compound of the rare metal molybdenum, molybdic acid is a colorless triclinic or yellow monoclinic solid powder formed by combining molybdenum trioxide (MoO?) and water in a specific ratio. It is a hydrated molybdenum oxide composed of hydrogen ions (H?), hydroxide ions (OH?), and molybdate ions ((MoO?)2?). Its English name is Molybdic Acid, with a molecular formula typically of MoO?·2H?O, a molecular weight of 179.97, and a CAS registry number of 7782-91-4. The solid form of molybdic…

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Barium Tungsten Electrodes for Solar Simulators 36

Solar simulators are critical equipment for the research, development, and quality testing of photovoltaic devices. Their primary function is to accurately replicate the spectral distribution, irradiance intensity, and spatial uniformity of sunlight. As a key component of the simulator’s light source system, barium tungsten electrodes play an irreplaceable role in enhancing light source performance and ensuring testing accuracy. Applications of Barium Tungsten Electrodes in Solar Simulators 1. Core Electrode Material for Xenon Lamps Xenon lamps have become the mainstream light…

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Barium Tungsten Electrodes for Surgical Shadowless Lamps 31

Surgical shadowless lamps are critical devices used in operating rooms to illuminate surgical sites. Their core function is to project light onto the surgical area at specific angles through the reflection and refraction of multiple light sources, preventing shadows caused by the surgeon’s head or instruments and providing a clear, uniform surgical field of view. Key requirements for these lamps include high brightness, low heat output, precise color temperature control, and long service life to meet the stringent lighting demands…

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Barium Tungsten Electrodes for Industrial Sterilization 29

Barium tungsten electrodes are made of high-purity tungsten as the main component and are made by doping barium elements or their compounds (such as barium oxide). They are a high-performance cathode material that combines the high melting point and corrosion resistance of tungsten with the low work function characteristics of barium. In the field of industrial sterilization, barium tungsten electrodes are widely used in technologies such as plasma sterilization, ultraviolet sterilization, and electrochemical sterilization due to their efficient electron emission…

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