Watlow Electric ULTRAMIC 600 - Manual (Page 5)

Sintered Ceramic Heater Construction
ULTRAMIC™ 600 heaters are
manufactured using a proprietary sintering
process. Sintering is a method where
aluminum nitride (AlN) ceramic powder is
heated at a high temperature, which
allows contacting particles to diffuse
together. This process creates a
monolithic, geometrically stable structure
with very low porosity.
Custom designs can be rapidly accommodated
including those with complex topographies such as
holes, notches and vacuum grooves. Using a Finite
Element Analysis (FEA) technique, the heater circuit is
optimized and the thermal performance simulated
prior to manufacture.
The high thermal conductivity of AlN
and an optimized circuit layout
combine to produce superb
temperature uniformity across the
heater surface.
Non-contaminating
AlN composition
The AlN matrix is constructed of two parts. The
heating element is printed on one of the AlN
parts. Then, the parts are sintered together,
making them one homogeneous assembly.
ULTRAMIC 600 Thermal and Physical Properties
AIN
Thermal Properties Physical Properties
Thermal Conductivity (W/mK) 140 Density (g/cm 3 ) 3.26
CTE (ppm/˚C) 4.5 Hardness (Hv@500g) 1050
Surface Temperature 600˚C (1112˚F) Flexural Strength (MPa) >250
Terminal Temperature 400˚C (752˚F)
399.5
399.7
399.9
400.1
400.4
400.6
400.8
401.1
401.3
°C
401.5