Cobalt Alloys

Cobalt Alloys

 

alloys based on cobalt; used primarily in the manufacture of components operating at high temperatures, such as blades for turbojet engines.

“Casting” cobalt alloys are alloys of the Co-Cr-C-X system, where × is tungsten, molybdenum, niobium, or nickel, that exhibit good casting properties. Since hardening of these alloys is effected mainly by the carbide phases, they contain 0.2–1.0 percent carbon. The addition of boron improves the casting properties of the alloys but it may decrease their weldability.

Cobalt alloys are highly resistant to thermal fatigue. The average thermal expansion coefficient is low [(15.9–16.5) × 10-6 1/ °C] within the temperature range of 20°–870°C. The most heat-resistant cobalt alloys maintain their durability at temperatures up to 1100°C. Long-term ultimate strength Cobalt Alloys meganewtons per sq m, or 7 kilograms-force per sq mm. Cobalt alloys of the Co-Cr-Ni-Mn system, which contain up to 50 percent Co (deformable cobalt alloys), exhibit high resistance to thermal fatigue and can be worked under pressure. Cobalt alloys called stellites (30 percent Cr, as well as W, Si, and C) are used for hard-facing of machine tools and parts (without subsequent heat treatment) to increase their wear resistance. As a basic or alloying element, cobalt is one of the magnetic materials.

References in periodicals archive ?
Aerospace is also heavily investing in cobalt alloys, nickel alloys and aluminium alloys.
Cobalt alloys are erosion- and corrosion-resistant metals designed to retain high strength during long-term exposure to high temperatures.
Sandvik Materials Technology, a world-leading manufacturer of high value-added products in advanced stainless steels and special alloys, and ThyssenKrupp VDM, one of the world's leading suppliers of nickel and cobalt alloys, titanium and other high-performance materials, have announced that they have agreed on a cooperation on the production and sale of zirconium products.
Lack of information on manufacturing cobalt alloys and uncertain limits of high speed domain found in bibliography for superalloys--from 200m/min (Schultz) to 400m/min (Denkena et.
The remaining chapters address passivity, iron and steel, effect of stress, atmospheric corrosion, corrosion in soils, oxidation, stray-current corrosion, cathodic protection, metallic coatings, inorganic coatings, organic coatings, inhibitors and passivators, treatment of water and steam systems, alloying stainless steels for corrosion resistance, copper and copper alloys, aluminum and aluminum alloys, magnesium and magnesium alloys, nickel and nickel alloys, cobalt and cobalt alloys, titanium, zirconium, tantalum, and lead.
Both the SAC 305 and cobalt alloys exhibited no deterioration in solder attachment integrity after 1,000 thermal cycles (Figure 1).
I was able to go through with my (analyzer), and I picked out higher grades of stainless; I picked out nickel alloys; I picked out cobalt alloys.
Most of these parts are produced from difficult-to-process high-temperature materials such as Inconel, Hastelloy, and super cobalt alloys and require special holes of different sizes and shapes that are drilled at varying angles.
This report analyzes the worldwide markets for High Performance Alloys in Metric Tons by the following Product Segments: Nickel Alloys, Cobalt Alloys, and Titanium Alloys.
Advances presented include glass formation abilities of certain alloys, applications of shape-memory alloys, cobalt alloys and composites, aluminum alloys, metal matrix composites and titanium alloys, with special attention to high-temperature materials such as niobium alloys and composites, Mo-Si-B alloys for ultrahigh temperature applications, and nickel-based alloys.
The unique combination of the abrasive grain and the improved supersize grinding aid also greatly reduces the heat generated when grinding stainless steel and nickel and cobalt alloys.
3% carbon) such as steels, nickel alloys, cobalt alloys, and cemented carbides, dramatically hardening the surface of the materials treated.