JAINEX

INDUSTRIAL CORPORATION

TANTALUM

Nickel (Ni)

Name

 Nickel

Symbol

Ni
Atomic Number 28
Atomic Weight 58.6934 (2)
Color Lustrous Metallic  Silvery  tinge

General Information

Nickel is found as a constituent in most meteorites and often serves as one of the criteria for distinguishing a meteorite from other minerals. Iron meteorites, or siderites, may contain iron alloyed with from 5 to nearly 20% nickel. The USA 5-cent coin (whose nickname is "nickel") contains just 25% nickel. Nickel is a silvery white metal that takes on a high polish. It is hard, malleable, ductile, somewhat ferromagnetic, and a fair conductor of heat and electricity.

Nickel carbonyl, [Ni(CO)4], is an extremely toxic gas and exposure should not exceed 0.007 mg M-3. Here is a brief summary of the isolation of nickel.

It is not normally necessary to make nickel in the laboratory as it is readily available commercially. Small amounts of pure nickel can be isolated in the laboratory through the purification of crude nickel with carbon monoxide. The intermediate in this process is the highly toxic nickel tetra carbonyl, Ni(CO)4. The carbonyl decomposes on heating to about 250C to form pure nickel powder.

Ni + 4CO (50C)   Ni(CO)4 (230C)   Ni + 4CO

The Ni(CO)4 is a volatile complex which is easily flushed from the reaction vessel as a gas leaving the impurities behind. Industrially, the Mond process uses the same chemistry. Nickel oxides are reacted with "water gas", a mixture of CO + H2). Reduction of the oxide with the hydrogen results in impure nickel. This reacts with the CO component of the water gas to make Ni(CO)4 as above. Thermal decomposition leaves pure nickel metal.

 

CHARACTERISTICS OF SOME NICKEL, HIGH TEMPERATURE & CORROSION RESISTANT ALLOYS
 

NICKEL 200/201

DESCRIPTION : NICKEL 200 is a commercially pure Nickel used in corrosive environments tough and ductile at both high and low temperatures. 201 is similar to 200 except that the carbon is restricted to  0.02% max. Ni 201 is preferred to Ni200 for applications involving exposure to temperatures above 600F.

APPLICATIONS : Food Processing Equipment, Shipping Drums for chemicals, Caustic Handling equipment, plated bars, Aerospace and Missile components, Magneto stricture devices.  

CHEMICAL COMPOSITION(%) :NICKEL 200  Nickel  :  99.2 ; Manganese : max : 0.3 ; Iron : max.0.4 ; Magnesium : max 0.05;     Copper : max. 0.25 ; Carbon max 0.10;  

NICKEL 201  Nickel  :  99 ; Manganese : max : 0.35 ; Iron : max.0.4 ; Magnesium : max 0.05;     Copper : max. 0.25 ; Carbon max 0.20;  

 

PHYSICAL PROPERTIES :

NICKEL 200

NICKEL 201

Density (g/cm3) 8.9

8.9

Specific Heat J/KgK 456

456

Thermal conductivity W/m K : 79 79
Electrical resistivity  μ cm 8.5 9.5
Thermal expansion 10-6 /K 20-3000C 14.3 14.5
Modulus of elasticity KN/mm2 207 208

 

THE SIMPLIFIED NUMBERING SYSTEM FOR NICKEL ALLOYS
 
200 series
300 series
NICKEL System 600 series
700 series
INCONEL System (Nickel-Iron-Chromium-Iron)
Solid solution* alloys
Age-hardenable* alloys
Solid solution* alloys
Age-hardenable* alloys
400 series
500 series
MONEL System (Nickel-Copper) 800 series
900 series
INCOLOY System (Nickel-Iron-Chromium-Iron)
Solid solution* alloys
Age-hardenable* alloys
Solid solution* alloys
Age-hardenable* alloys

*Solid solution alloys belong to EVEN numbered series and do not harden by heat treatment.
*All alloys hardenable by ageing (heat treatment) begin with ODD number.

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INCOLOY, INCONEL, MONEL ARE WIGGIN TRADE MARK