SU950701A1 - Ceramic material - Google Patents

Description

(54) CERAMIC MATERIAL

The invention relates to the production of ceramic materials with high dielectric properties and can be used in the microelectronic, electronic, and radio engineering industries. The ceramic material is known as the base of alumina and glass powder, including SiOij, AlfjOa, MgO and CaO 11. The sintering temperature is a disadvantage of this material. Closest to the proposed one is a ceramic material 2 based on alumina (85.1390, 0 wt.%) With the addition of aluminum nitride (0.1–2 wt.%) And RO (ROa) -Al7.0i-Br2 glass 0a, (Pri05) (9.9 13, 87 wt.%) Of the following composition: A1 10z0.1-21.0 MgO0.1-9.78 BaO39.7-59.44 BaOz16.8-28.8 PaOs0, 1-13.78, 1-8.3 The disadvantage of this ceramic material is the relatively high dielectric constant value (5.5-8.5). The purpose of the invention is to reduce the dielectric constant. The goal is achieved by the fact that in a ceramic material based on aluminum oxide and glass, including AlijO, MgO, BaO, TiOrj H, glass additionally contains CaFij in the following ratio of components (wt.%), Respectively, in a ceramic material: Alumina Glass in glass: 17, 13 2.09-17.96 0.1-39.73 0.1-4.14 28.86-35.44 4.05-28.8, This ceramic material was prepared as follows. First, a mixture is prepared that includes the wt.%: A1 (OH) 130.05-137.7 Glass powder 10-15 The glass is pre-cooked at 1050-1100 ° C. The resulting glasses are characterized by CTE (76-78). 10 degrees; The glasses are then crushed to a specific surface, (5-7) 10 cm Vr and injected

in the specified amounts in ceramic for the ceramic material. Mixing the components of the mixture is carried out in a corundum drum with corundum balls in isopropyl alcohol for 20 hours. The resulting mass is dried, the briquettes are pressed and burned at NOOO-IBO C. The temperature is raised during calcination. Burnt briquettes were crushed and crushed in a corundum drum for 48 hours to a specific surface area СЗ5) - 10. Samples are pressed from the obtained mixture at a specific pressing pressure of 1000 kg / cm. A mixture consisting of 70% des-percent aqueous solution of polyvinyl alcohol and 30% glycerol is used as a binder. Samples

Appearing with porosity,%

Coefficient of linear thermal expansion, oL

Static flexural strength, kgf / cm Dielectric loss tgcf frequency 10 ° Hz and temperature, ° С

20 ,

100

sintered at 1200-1350 0 for 2 hours.

The compositions of the obtained ceramic. These materials are listed in Table 1.

The resulting ceramic materials. characterized by the properties listed in table. 2

Ceramic materials of these compositions are characterized by high physicomechanical and dielectric properties at the firing temperature of materials 1225-1350 ° C.

The use of the proposed ceramic material with a lower calcination temperature allows a significant reduction in the specific energy consumption per unit of production, which will predetermine the lower cost as compared with the known materials.

Table 1

table 2

0.00

0.00

79

79 3000 3000

5.0

3.0 4.0 8.0 5.0 1.21

Claims (1)

Claims of the invention A ceramic material based on alumina and glass, including MgO, BaD, TiO, B, 0, O t l IC (with the aim that, in order to reduce the dielectric constant 25, glass additionally contains CaF in the following ratio Ponents (wt.%), respectively, in a ceramic material: JQ Alumina, 85-90. Glass 10-15 S glass: Continued table. 2 5.0 4.0 3.0 5.0 4.0 5.0 3.0 5.0 2.4 5.0 6.0 1.20 1.20 1.19 17.6-21.13 2.09-17.96 Oh, 1-39,73 0.1-4.14 28; 86-35.44 4.05-28.8 information during examination certificate of the USSR 04 V 35/18, 1970. The certificate of the USSR 04 In 35/10, 1978