Date post: | 29-Mar-2016 |
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D-MAX Zirkonio
1. Scanning (Delcam option)
DMAX
M Ma ax x h he ea at ti in ng g r ra at te e : : 1 10 00 0 / /m mi in n, , M Ma ax x T Te em mp p : : 1 16 60 00 0
3. Sintering (Microwave sintering furnace)
1500 3h by conventional furnace 1500 5 min by microwave furnace1500, 3h by conventional furnace 1500, 5 min by microwave furnacesmaller grains and less pores compared with conventional furnace
3. Sintering (Microwave sintering furnace)Microwave furnaceMicrowave furnace Conventional furnaceConventional furnace
Heating rateHeating rate ~ 100 /min ~ 5 /min
Maximum temp.Maximum temp. 1600 1600
Retention timeRetention time Less than 30 minutes More than 2 hoursRetention timeRetention time Less than 30 minutes More than 2 hours
Particle sizeParticle sizeVery fine grains
(rapid heating & short time sintering)Grain growth
(long time sintering)(rapid heating & short time sintering) (long time sintering)
DensityDensity Fine structure Pore remainsStrengthStrength Stronger than conventional (~1.2) 1gg g ( )
Furnace sizeFurnace size 1/10 vs. conventional 1
4. Zirconia block manufacturing process
Binder
Manufacturing process planning Base powder Press CIP Pre-sintering
* CIP (Cold Isostatic Pressing)
Furnace
PressSpray Dryer
5. DMAX Zirconia block
High density Less pore
More translucent Harder High fracture toughnessLess pore
Uniform particle size High fracture toughness Aging property No shrinkage difference
(MPa) (MPa.m1/2)
810
Toughness
12001400
Bending strength
2468
400600800
10001200
00200
Strength and toughness test of DMAX sintered zirconia block in accordance with ISO 6872
5. DMAX Zirconia block
High density Less pore
More translucent Harder High fracture toughnessLess pore
Uniform particle size High fracture toughness Aging property No shrinkage difference
Aging test
1000
2000 ISO13356maximum amount of monoclinic phase after < 25%
00 year 5year 10year 40year
accelerated aging
residual biaxial flexureh
> 500 MPa, and dstrength decrease not more than 20 %
Aging test of DMAX sintered zirconia block in accordance with ISO 13356
Sample shape5. DMAX Zirconia block Sample shapeA1 T1 K1 K2 K3 Shape
Diameter 19 78 19 32 20 00 19 98 19 99() 19.78 19.32 20.00 19.98 19.99 DT
Thickness() 0.965 0.849 0.863 0.858 0.857
T
Diameter measured using Mytutoyo cop calipers Thickness measured using Mytutoyo cop Micrometer
K1, K2, K3 : DMAX blockT1 : Tohso blockA1 : cercon block
5. DMAX Zirconia block
Transmittance Data0.6
K3K2
0 4
0.5
T1
K1
0.3
0.4
%
T
A1T1
0 1
0.2
200 300 400 500 600 700 800 9000.0
0.1
Wavelength (nm)