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| Lead Powder |
Lead powder
is often produced by dispersing melted lead. Drops of molten lead are atomized
using a jet of high temperature gas. The lead can be introduced into the gas
stream in the same direction as the gas flow, by use of an annular nozzle, or
the molten lead can be dripped into a perpendicular stream of gas. The first
method produces finer lead powder and is therefore more useful in certain
applications such as lead bases anti-friction lubricants.
In a typical
manufacturing process the lead is melted in a crucible, the liquid metal flows
out of an hole, of precise dimensions, in the bottom of the crucible and more
molten metal is added to maintain a constant level – this will ensure a
constant rate of flow through the hole in the bottom of the crucible. The metal
flows into a gas jet that has been heated to about 200oC and is dispersed into
small particles up to a few microns in size.
Lead powder
can also be produced by electrolysis, though this is not that important a
method. Thermolysis, using oleic acid produces very small particles that are
suitable for lubricants.
Lead oxide;
also know as litharge lead or Lead Monoxide is another form of lead that is
produced as a red or yellow crystalline powder. Litharge is produced by
contacting molten lead with air. Lead Monoxide is obtained as a crystallized or
amorphous power.
Applications
Oil and gas
exploration, Radiological Medical protective clothing, Industrial X-ray
shielding, Golf club manufacturing, Anti-friction products.
Powered
lead, powdered Babbitt and lead oxide have been used in lubricating grease, to
reduce or eliminate wear. Lead powder is also used as the basis for some
corrosion resistant paints. Lead oxides are used in producing fine “crystal
glass” and “flint glass” of a high index of refraction for achromatic lenses.
Powdered Lead in Golf clubs
Custom golf
club makers use powdered lead to balance and weight the clubs. There is
typically a cavity int head, accessible through a small hole sealed with a
screw. Swing weight can be adjusted by removing this screw, adding a measured
amount of powdered lead and replacing and securing the screw with epoxy.
Lead protective clothing
Lead powder
incorporated into plastics is used to form sheets of Lead loaded plastic. This
is used to make radiation protective clothing and aprons for the medical,
scientific and nuclear industries. Lead loaded plastic is also used to make
sound insulating barriers.
Lead powder in weapons
In the law enforcement shotgun rounds containing
powdered lead are called breaching rounds. They are used on door hinges and
handles to gain entry. Generally used by drug, warrant and swat teams. Powdered
lead is used to minimize harm to individuals.
Weighted-knuckle
gloves, also called sap gloves, are a type of weapon used in hand to hand combat.
They consist of a pair of ordinary looking gloves usually made of leather or a
synthetic material, with powdered lead sewn into a special pouch covering the
knuckles, fingers and the back of the hand. They are primarily used by security
professions and private citizens for self-defense.
Lead Powder in the electronics
industry
Highly
densified, polycrystalline photoconductors can be made by hot-pressing powdered
lead monoxide. Such photoconductors will exhibit increased absorption of
radiation, increased signal-to-noise ratios, and improved spatial frequency
responses.
Lead Powder
is also used for the preparation of pressed and bonded sputtering targets and
in Chemical Vapor Deposition (CVD) systems.
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