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Application of Tungsten Crucibles in Single Crystal Growth 51

Single crystal growth is a key process for the preparation of high-purity and structurally perfect crystals, which are widely used in semiconductors, photovoltaics, lasers and optical devices, such as the preparation of silicon single crystals, sapphire single crystals and gallium arsenide single crystals. As a high-temperature container, tungsten crucibles are able to withstand extreme process conditions, ensuring stable and high quality crystal growth. Role in the growth of single crystals Single crystal growth is typically done using processes such as…

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Application of Tungsten Crucible in High-Temperature Melting 40

High-temperature melting usually involves the preparation of metals, rare earth elements or special alloys with high melting points, and the process environment is harsh, and the requirements for container materials are extremely high. With its unique properties, tungsten crucible has become the preferred container for high-temperature smelting, and its application involving metallurgy, aerospace, rare earth smelting and other industries. The role in high-temperature melting High-temperature smelting usually needs to be carried out in an environment above 2000°C or even close…

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What Are the Main Applications of Tungsten Crucibles? 41

Tungsten crucibles are used in a wide range of applications due to their extremely high melting point, excellent high-temperature strength, good thermal conductivity and strong chemical inertness in vacuum or inert atmospheres. 1. Semiconductor single crystal growth (1).Czochralski During the growth of silicon single crystals, the crucible must withstand high temperatures of about 1400 °C and be in contact with molten silicon for long periods of time without chemical reactions. Due to its high-temperature strength and chemical stability, tungsten crucibles…

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What Are the Main Properties of Tungsten Crucible? 39

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? 32

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 36

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 38

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 36

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 28

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 28

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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