Scientific background of doped tungsten wires

The systematic and purposeful doping of tungsten oxide powders was already patented in 1922. However, the doping of elemental potassium and its role in the formation and stabilization of creep-resistant recrystallization intercalated microstructures was only understood after 1964, when new tools for scanning and transmission electron microscopy and new instruments for surface analysis, especially Auger-Electron-Spectrometry (AES), could be used to perform modern microstructural and chemical analysis of nanometer-sized aggregates. Modern microstructural and chemical analyses were performed.

The Invention of Hard Metals

The next important milestone in the chronology of the development of doped tungsten wires is 1923, which marked the year when K. Schröter, chief engineer of the OSRAM research group in Berlin, Germany, made a cemented carbide or hard metal by combining tungsten carbide (WC) and cobalt powder through mixing, pressing and liquid-phase sintering.

The Coolidge Process

William D. Coolidge (1873-1975), Figure 8, began his career at GE's research laboratory in September 1905. Interestingly, Coolidge's first task was to investigate the cause of the rapid breakage of the filament of the German tantalum lamp when operating under alternating current, most likely due to the limitations of the lamp's cavity technology and the residual gas in the bulb.

From a historical perspective, William D. Coolidge's development PM process and tool "for making tungsten ductile" in 1909 marked the beginning of the use of tungsten filaments in the lighting industry. William D. Coolidge's development of the PM process and tools to "make tungsten ductile" in 1909 marked a breakthrough in the use of tungsten filaments in the lighting industry and began the modern industrial era of Powder Metallurgy.

In recent years, tungsten rings have been a popular choice for their durable and scratch-resistant properties. However, they can also lose their luster over time. Below, we will explain how to take care of your tungsten wedding ring.

Atomically thin layers of semiconductors, such as molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂), are promising materials for nanoscale photonic devices. These nearly two-dimensional semiconductor support so-called excitons or bound electron-hole pairs, which can be aligned vertically along the thin planes of the material.

Hydrogen (H₂) is a green and economical alternative to conventional fossil fuels due to its zero carbon emission. 2D molybdenum diselenide (MoSe₂) hosts significant applications in hydrogen generation due to its low hydrogen adsorption Gibbs free energy and good electrical conductivity. The development of efficient hydrogen evolution reaction (HER) catalysts is of great interest for economical green hydrogen production.

Recent research discusses the optical and self-cleaning properties of composite films titanium/tungsten/graphene oxide thin films. The article, published in Surface and Interface, develops a discussion of the optical properties of photocatalytic titanium dioxide - tungsten trioxide - reduced graphene oxide (TiO₂-WO₃-rGO) (TWG) and TiO₂ films and the feasibility of using these films for different applications, particularly as self-cleaning coatings (SCC).

Tungsten grinders usually hold powerful motors and work by using grinding wheels to remove material from metal workpieces. This equipment could be used for grinding, slicing, polishing as well as welding. Since tungsten rod grinders are more robust than other types of grinders, they are also commonly used in the automotive sector.

A recent study demonstrates hydrogen-impurity induced magnetism in molybdenum ditelluride (MoTe₂). Layered transition-metal dichalcogenides (TMDs) are a promising class of materials with optoelectronic, superconducting, catalytic, and topological properties. In TMDs, the polymorphic MoTe₂ exhibits various electronic and magnetic properties. Its metallic 1T' phase turns into a Td phase at ≈250 K. The latter is a topological Weyl semimetal with unconventional superconductivity at low temperatures.