Deutschlands großes Presseportal - Homepage
» kostenlos Pressemitteilung veröffentlichen
» Kunden Login zu "meine Redaktion"
»Suche / Lokale Suche
> Startseite > Industrie & Handwerk

What is The Basic Tungsten Metal Like

Tungsten is the most plentiful of the refractory metals. However, about half of the world's reserves are found in China.
Korea is another important source along with Bolivia, Portugal, Australia, Thailand, Canada and United States. Despite its resources, the United States still must import most of its consumption. Since the late 70’s the use of W reclaimed from scrap has steadily increased. Estimates today are that about 30% of W consumption is from scrap. Tungsten has the highest melting point of all metals. It also has one of the highest densities of all metals. When combined with carbon, it becomes one of the hardest man-made materials. While most people are familiar with tungsten filaments for light bulbs, its most common and most invaluable use is in metal cutting, mining and oil drilling tools. Actually, there are three different tungsten materials and each has its own areas of application: (1) tungsten metal, (2) tungsten carbide, and (3) tungsten heavy metals. However, all start with the same powder form.
It has the highest melting point, 3410oC (6170oF), and one of the highest densities of any metal. It also has exceptional strength at ambient and elevated temperatures.
Although tungsten can be used at high temperatures, oxide films become volatile above temperatures of approximately 538oC (1000oF). So, for use at extremely high temperatures, tungsten parts must be coated, used in a vacuum; or be surrounded by a protective atmosphere. Typical uses involving protective atmospheres - or vacuum - include incandescent lamp filaments, electron tube electrodes and various types of heating elements.
Silicide coating and noble metal cladding are effective oxidation-resisting coatings; for example, cladding the tungsten with platinum-gold alloys.
Tungsten has good resistance to water and atmospheric corrosion at ambient temperature, and is resistant to many severe environments which readily attack other metals. It resists nitric, sulfuric and hydrofluoric acids at room temperatures. It is inert to oxygen-free liquid ammonia at room temperature. It is only subject to slight attack by hot alkaline solutions such as potassium, sodium and ammonium hydroxides.

Tungsten also has good resistance to several liquid metals including sodium, mercury, gallium, and magnesium; to oxide ceramics such as alumina, magnesia, zirconia and thoria. It is often used for crucibles to melt these materials in an inert atmosphere. Although resistant to hydrogen, tungsten reacts at high temperatures with carbon dioxide, carbon monoxide, nitric oxide, nitrogen dioxide and sulfur.

09.01.2018 10:23

Das könnte auch Sie interessieren:

J.v.G. Thoma announces the launch of the new J.v.G. LED Flas...
The internationally renowned German company, J.v.G. Thoma GmbH, is proud to announce the launch of the new LED Flasher Basic 2.0, which is expected to revolutionise the world of photovoltaic solar module testing with its unparalleled precision,...

Wechsel im Aufsichtsrat der Leifeld Metal Spinning AG
Dr. Georg Kofler, Eigentümer der Leifeld Metal Spinning AG, ist neuer Vorsitzender des Aufsichtsrates. Dr. Kofler wurde in der jüngsten Aufsichtsratssitzung der LEIFELD im Dezember als Nachfolger von Holger Hansen gewählt. Den bisherigen...

Hört Franka eigentlich noch Black Metal?
Im August erscheint die zweite Veröffentlichung von Mikis Wesensbitter "Hört Franka eigentlich noch Black Metal" in der Edition Subkultur. 12 Jahre schrieb der Berliner Autor an der Saga um Kirk, Franka und ihre Clique. Was als Fortsetzungsstory im...

Goldsparpläne im Vergleich - Die Noble Metal Factory erreich...
Auf der Internetplattform „goldsparplä “ wurden 35 verschiedene Goldsparpläne mit über 60 Tarifen auf Herz und Nieren geprüft. Die Noble Metal Factory erreichte dabei einen grandiosen dritten Platz. Wie funktionieren die einzelnen...

ADT 1100 Design terminal from primion for all basic Time rec...
Autumn 2017 will see the product launch of primion’s new powerful and versatile ADT 11x0 product family for Time recording, Factory data collection and Access control. All the terminals will be characterised by their fresh, contemporary design. One...

Λ nach oben


Pressemitteilung von:

Stanford Advanced Materials

Stanford Advanced Materials
23661 Birtcher Dr.
Lake Forest, California, 92630
Tel: (949) 407-8904
Fax: (949) 812-6690

Stanford Advanced Materials SAM is a global supplier of a series of pure metals, alloys, ceramics and minerals such as oxides, chlorides,sulfides, oxysalts, etc....

mehr »

zur Pressemappe von
Stanford Advanced Materials

weitere Meldungen von
Stanford Advanced Materials

mehr »



Hinweis: Um Ihnen ein optimales Nutzererlebnis zu bieten, verwenden wir Cookies. Durch die Nutzung dieser Webseite erklären Sie sich damit einverstanden.   Nachricht schließen   mehr info