Composite Powder for Low Temperature Cofired Ceramics
Composite material blended with glass and ceramic powder
Composite Powder for Low Temperature Cofired Ceramics (LTCC) can be fired at 870 to 900°C. This allows the use of gold or silver paste, which offer high electrical conductivity, for the inner layer conductor—resulting in circuit substrates with excellent electrical properties.
Properties
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MLS-25M: Vitreous material with a low coefficient of thermal expansion and low dielectric constant.
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MLS-25E: Vitreous material with a dielectric constant of less than 4 and a low dielectric constant.
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MLS-41: Devitrifiable material with a high dielectric constant.
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MLS-23K: New product with a low dielectric constant and low dielectric loss tangent.
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MLS-63: Devitrifiable material with high mechanical strength and low dielectric loss.
| Properties/Glass code | MLS-25M | MLS-25E | MLS-41 | MLS-23K | MLS-26 | MLS-63 | ||
|---|---|---|---|---|---|---|---|---|
| Bending strength | MPa | 157 | 125 | 250 | 150 | 320 | 400 | |
| Dielectric constant | 1MHz, 25℃ | 4.9 | 3.9 | 17.0 | 3.9 | 7.1 | 8.0 | |
| 15GHz, 25℃ | 4.8 | 3.9 | 19.0 | 4.0 | 6.7 | 7.9 | ||
| tan δ | 1MHz, 25℃ | ×10-4 | 25 | 5 | 20 | 5 | 4 | 5 |
| 15GHz, 25℃ | 47 | 21 | 50 | 15 | 58 | 11 | ||
| Coefficient of thermal expansion | 30～380℃ | ×10-7/K | 42 | 60 | 84 | 65 | 58 | 87 |
| Density* | ×103kg/m3 | 2.52 | 2.29 | 4.36 | 2.24 | 3.02 | 3.52 | |
| Transformation point | ℃ | 500 | 500 | 700 | 525 | 625 | 725 | |
| Volume resistivity Log ρ | 150℃ | Ω･cm | 13.5 | >14 | - | >13.8 | 12 | >14 |
| Thermal conductivity | W/m･K | 1.9 | 1.7 | 3.1 | 1.7 | 3.9 | 4.1 | |
| Particle size | D50 | μm | 3.3 | 3.5 | 1.1 | 1.0 | 2.6 | 1.6 |
| Dmax | 20 | 20 | 10 | 15 | 15 | 10 | ||
| Glass type | SiO2･B2O3 | Nd2O3･TiO2･SiO2 | SiO2･B2O3 | SiO2･CaO･Al2O3 | ||||
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Powder theoretical density
Application Examples
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Casting and Printing
Glass-ceramic powder, binder resin, solvent, and plasticizer are thoroughly mixed and cast into a 50-300μm thick green sheet using the doctor blade method. Individual sheets are cut into appropriate sizes from the green sheet and punched with via holes and then screenprinted with a circuit pattern. -
Lamination
Green sheets are laminated at 50-100°C and under 10-35 MPa pressure. -
Firing
Firing is carried out in the air. [Fig. 1]
High-Frequency Dielectric Properties of MLS-63
Dielectric constant
tan δ
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Functions and Characteristics