TDkote Tri Cplus™
TD Coating Process
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Richter Precision Inc. is pleased to introduce the Thermoreactive
Diffusion (TD) process, TDkote Tri Cplus™, to our standard
line of thin-film wear-resistant coatings for tooling and components.
The TDkote Tri Cplus process will complement our existing line of
Chemical Vapor Deposition (CVD) and Physical Vapor Deposition (PVD)
coatings, and provide Richter Precision Inc.'s customers with a
greatly increased level of service.
 What
is TD?
Thermoreactive
Diffusion (TD) is a high temperature coating process for producing
metal carbides (typically vanadium carbide) on the surface of a
carbon-containing substrate. This is a multi-stage coating process,
including pre-heat, a coating segment, ultra-sonic cleaning, and
heat treating.
Our
TDkote Tri Cplus™ coating exhibits a diffusion type bond with
the substrate, thereby providing very high adhesion between the
metal carbide layer and the substrate. This bonding characteristic,
combined with the coating's extremely high hardness, translates
into excellent resistance to the types of wear and galling typically
seen during many metal-forming applications.
What
makes Richter Precision, Inc.'s TDkote Tri Cplus™ different?
Our TDkote Tri Cplus™ coating process takes the TD coating
technology to the next level by adding multiple complex carbides
to the coating matrix. These proprietary additions provide for increased
hardness, toughness, wear-ability, and lubricity: these improvements
go beyond what has typically been available with simple vanadium
carbide.
Applications:
TD coatings
are typically used in many of the same applications as CVD coatings.
While the choice between TD and CVD coatings have largely been a
matter of preference rather than performance , there are some applications
where TD has shown itself to be superior: aluminum and zinc die-casting,
components (molds, cores, etc.), hot forging tools, and tools for
stamping and forming stainless steels. The following are all typical
applications for the TD process:
Extrusion
Punches & Dies, Perforating Punch, Burring Punch, Shaving Punches,
Embossing Rolls & Punches, Coining Punches & Dies, Draw
Punches & Dies, Knurling Tools, Bending Dies, Forming Dies,
Hot Forging Dies, Powder Compaction Dies, Draw Plugs, Tube Mandrels,
Die-Casting Molds & Cores.
It
is recommended that customers discuss their various applications
with on of our coating specialists. Our staff can help you to determine
the appropriate coating process and composition for your particular
requirements.
>>
Click
Here, to see Richter Precision's coatings technical
data
>>
Below is a chart showing comparison of three major coating processes:
TD |
CVD |
PVD |
| Performed
in an elemental salt bath |
Can
be performed in controlled atmosphere or vacuum |
Performed
in a vacuum chamber (10-2 to 10-4 Torr) |
High
temperature process (1650° to 1900°F) |
High
temperature process (1925°F) |
Relatively
low process temperature (200° to 800° F) |
Reactive
bath process coats wherever molten bath contacts tool
surface |
Reactive
gas process coats wherever atmosphere contacts tool
surface |
Line
of sight process: will coat areas directly exposed to
ion source |
Coating
exhibits a diffusion type bond to the substrate |
Coating
exhibits a chemical & metallurgical bond to the
substrate |
Coating
exhibits a physical bond to the substrate's surface |
Average
thickness: 5-15 µm, or .0002-.0006" |
Average
thickness: 6-10 µm, or .00024-.0004" |
Average
thickness: 2-5 µm, or .00008-.0002" |
More
limited range of substrates than for PVD, but less limited
than CVD |
More
limited range of substrates than for PVD |
Suitable
for a wide range of substrates |
Requires
relatively loose tolerances (example: +/-.0005 per 1.0"
diameter) May be more forgiving than CVD |
Requires
relatively loose tolerances (example: +/-.0005 per 1.0"
diameter) |
Ideal
for closely toleranced components
(+/- .0001” is appropriate) |
Post-coating
heat-treating required on steel parts due to high process
temperature |
Post-coating
heat-treating required on steel parts due to high process
temperature |
No
heat-treating required after coating due to low process
temperature |
| Requires
hone on sharp edges due to heavier coating build-up |
Requires
hone on sharp edges due to heavier coating build-up |
Good
for sharp edges: no excessive coating build-up |
| Difficult
to maintain mirror finishes; however, ost-coating polishing
can achieve near mirror finishes |
Difficult
to maintain mirror finish (post-coating polishing will
improve finish) |
Coating
will generally replicate existing surface finish - mirror
finishes can be maintained |
|
|
