A porcelain insulator for extra-high voltage direct current transmission and a preparation method thereof

Abstract

The application relates to the technical field of ceramics, in particular to a porcelain insulator for extra-high voltage direct current transmission and a preparation method thereof. The method comprises the following steps: carrying out nitric acid surface activation on crystalline quartz powder, then sequentially carrying out yttrium complex precursor anchoring treatment, lanthanum salt-phosphate fixing treatment and lanthanum complex precursor transition treatment to obtain rare earth modified quartz micro powder; and pre-grinding kaolin, alumina and potassium feldspar powder, then adding the rare earth modified quartz micro powder to prepare a blank and sintering. According to the scheme, a rare earth-rich interface transition structure is constructed at the outer edge of the quartz phase, and the destruction of the structure in the ball milling process is reduced through the post-adding process, so that the compactness, volume resistivity and direct current artificial contamination withstand voltage of the porcelain part are improved, and the dielectric loss and leakage current are reduced.