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Thin, dense, chromium coatings with
hardnesses of 78/98 Rc
Armoloy TDC is a hard, thin,
dense chrome coating with a micro-nodular surface texture that was
developed to protect a wide range of tools and components. The
Armoloy TDC (thin dense chrome) coating is applied in a chemical
bath by means of a proprietary process. Armoloy TDC has a hardness
of 78 Rc; XADC-Armoloy features the inclusion of a synthetic
nano-diamond particulate, to the TDC bath, resulting in hardness of
98 Rc.
Armoloy® TDC Thin Dense Chrome
When
first introduced in 1957, Armoloy TDC provided a 70 Rc surface
hardness. During 2000, the company embarked on a series of
experiments to improve this property, resulting in a surface
hardness of 78 Rc. The same excellent adhesion, high ductility, and
have corrosion resistance of Armoloy TDC have not been compromised
with the improved hardness level.
To
develop the greater hardness, density has been increased. Therefore,
when properly engineered on metal components, the Armoloy TDC
coating provides exceptional resistance to wear and corrosion, in
addition to greatly reduced friction.
The coating also features a microscopic, nodular surface
finish. This nodular finish reduces the amount of surface area
exposed to parts in contact with it, thereby substantially reducing
wear and friction rates. Furthermore, our micro-nodulation retains
lubricants longer, further reducing friction. In other words,
reduced surface area + high hardness = longer wear rate = longer
wear life.
Another important aspect of Armoloy TDC is the uniformity of
the deposit thickness of the coatings, which are typically applied
at 1,0 to 17,5 microns (0.000040 to 0.0007 in.). Thinner coatings
can be applied with a higher degree of uniformity to a tightly
toleranced component. The recommended deposit thickness range of 2,5
to 7,5 microns (0.0001 to 0.0003 in.) is uniform to within +/- 0,625
microns (0.000025 in.). This allows Armoloy to return a finished
product to its customer and eliminates the need for post-coating
operations.
Armoloy TDC coatings have been applied to bearings, tools and
dies, pumps, plastic and rubber mold tooling, nuclear and aerospace
parts, hydraulics, food processing equipment, and a wide variety of
components where wear, abrasion, high friction and corrosion
environments are prevalent.
XADC-Armoloy® - Adding Nano-diamonds to
Armoloy TDC - 98 Rc
In 1997, after three years of
research and development, Armoloy introduced XADC, its newest
coating which attains a surface hardness of 98 Rc through the
addition of synthetic nano-diamond particulate to the TDC bath. In
addition to its 98 Rc hardness, its coefficient of friction is 20%
lower than that of other TDC coatings.
Western Michigan University
Study
A recent study by Dr. Paul Engelmann and others
at Western Michigan University demonstrated XADC's outstanding
performance. The XADC-Armoloy coating outperformed standard hard
chrome plating, electroless nickel, and titanium nitride in an
injection molding application on copper-base metal tooling molding a
33% glass-filled nylon, a highly abrasive plastic resin. As the
table shows, XADC-coated C18000 copper survived for 635,000 cycles.
Armoloy TDC-coated copper persisted for 155,000 cycles, and titanium
nitride tolerated only 57,000 cycles.
2001
Western Michigan University
Erosive Wear
Results
of Coatings and Copper Alloys |
| ALLOY |
SURFACE
TREATMENT |
CYCLES |
| C18000 |
XADC
- Armoloy® |
635,000 |
| C18000 |
Armoloy® TDC |
155,000 |
| C18000 |
TiN |
57,000 |
| C18000 |
Std.
Chrome |
54,000 |
| C18000 |
None |
46,000 |
| C18000 |
Electroless Ni. |
39,000 |
|
| C17510 |
XADC
- Armoloy® |
434,000 |
| C17510 |
Armoloy® TDC |
165,500 |
| C17510 |
TiN |
72,000 |
| C17510 |
None |
55,000 |
| C17510 |
Std.
Chrome |
46,500 |
| C17510 |
Electroless Ni. |
22,500 |
|
| C17200 |
XADC
- Armoloy® |
512,000 |
| C17200 |
Std.
Chrome |
425,000 |
| C17200 |
Armoloy® TDC |
99,500 |
| C17200 |
None |
51,333 |
| C17200 |
Electroless Ni. |
46,500 |
| C17200 |
TiN |
9,000 |
For more information: The
Armoloy Corporation, 114 Simonds Ave., DeKalb, IL 60115; tel:
815/758-6657; fax: 815/758-0268; e-mail:
armoloy@tbcnet.com |
