SU692810A1 - Ceramic material - Google Patents

Description

..1 The invention relates to ceramic-material materials and can be manufactured in electronic technology for the preparation of high-frequency thermostable capacitors. Ceramic material based on CaTiOj -ZajOj-TiO for high-frequency thermostable ionolithic capacitors {. This material has a low dielectric constant. Closest to the invention is a material based on ceramic sinter of barium titanate with a rare earth oxide from the series,. Ndj, Oj, SmjiOj and bismuth oxide 2. However, this Material is characterized by poor reproducibility of the pH of the dielectric properties and high sintering temperature. The aim of the invention is to increase the stability of the temperature coefficient of the dielectric constant and reduce the sintering temperature. For this, the ceramic material, mainly for high-frequency thermostable capacitors, based on ceramic-ceramic barium titanate with a rare-earth oxide from the series LdjOjiNdjOj (SntjOs and bismuth oxide), additionally contains zinc borate in the following ratio of initial components, wt.%: Cera: ceramic spectrum 95-97 Zinc borate. Moreover, ceramic sinter contains the initial components in the following ratio, wt.%: 17-20 29-38.5 bdjO-iNdiOjjStriaOa 5.5-17.0 ttijO, 37.0-39.5 T402 while zinc borate contains oxide boron oxide and boron in the following ratio ref one components, wt.%: UnO53-54.5. B, 0, 45.5-47. To obtain a ceramic material, first use the usual ceramic technology from PdCOj 7 (02, L1dOz and (where Zn-ta, Nd, Bra) cneKft "Ln fi b., A using two-fold synthesis at a pattern of 1100 ° C and 1320. Then zinc borate is synthesized from 1HO and" j Oj at a temperature

800-870 ° C. The speckles are crushed and make up the mixture of ceramic material from. Ba2n2 (gX) LnT1 ;, O and zinc borate, taken in the required ratio. After the initial mixing, the mixture is subjected to heat treatment at a temperature of 880- 70 ° C and crushed on a specific surface of 5500 cm;

From the powder material of any of the known methods molded blanks

capacitors that are calcined in an oxidizing environment at a temperature of 1020-1080s. In this case, a high reproducibility of the temperature coefficient of capacitance (TKE) of 5 capacitors is achieved, and an alloy (30 and 70%) of silver with palladium instead of platinum is used as their Electrodes.

The table shows the compositions and properties of the proposed ceramic material. .

Table