Influence investigation of technological parameters on the properties of celsian­slavsonite ceramics

Abstract

The article discusses the manufacturing technological parameters of a radiotransparent ceramic celsian­slavsonite material Ba_0.5Sr_0.5Al₂Si₂O₈ in a ratio of their crystalline phases of 50:50.

The technology for creating the prototype took place in two stages. The first stage — synthesis of combined celsian­slavsonote briquette was carried out in a silica furnace with an accelerated mode: the temperature set speed was 15 deg/min, the maximum firing temperature was 1300  C with holding for 1 hour. Then the synthesized briquette was ground in a planetary mill for 10 minutes (< 0.063 mm). The second stage took place at temperatures of 1300, 1350 and 1400  C with holding at a maximum temperature of 1, 2 and 3 hours.

Studies of samples on dielectric properties, water absorption and open porosity were carried out. The phase composition of obtained materials and their microstructure were investigated. The relationship between a dielectric constant and a grain size of the crystalline phase (Ba_0.5Sr_0.5Al₂Si₂O₈) was established.

The best indicators had the samples burned at a temperature of 1300—1350  C in an oxidized environment, with holding at a maximum temperature of 1—2 hours (ε = 4.264.52, W = 1.842.31  %, P_оpen = 4.355.43  %).