Preparation of forsterite-based glass ceramics for LTCC from potassium feldspar

摘要

A forsterite-based glass ceramic material has been developed from potassium feldspar for low temperature co-fired ceramics (LTCC). The crystalline phases and microstructure of forsterite-based glass ceramics were investigated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The results show only forsterite was formed in temperature range 900-1,050 ℃, and sapphirine was formed in temperature range 1,080-1,100 ℃. The glass compact could be well densified at 950 ℃, and full densification samples were obtained in temperature range 1,000-1,050 ℃. The physical properties including dielectric properties, bending strength and thermal expansion of the specimens were also evaluated. The dielectric constants are in the range 7.00-8.25 and dielectric loss is below 0.01 in the frequency range 1-10 MHz. The specimens obtained in temperature range 950-1,100 ℃ are of high bending strength (69-106 MPa). The linear coefficient of thermal expansion of the specimen sintered at 1,080 ℃ is 9.76 × 10~(-6) K~(-1). All of these qualify the forsterite-based glass ceramic for further investigation as a candidate suitable for applications in LTCC field.