Large-tonnage disc-shaped suspension ceramic insulator and prestressing assembling device and method for same

A large-tonnage disc-shaped suspension ceramic insulator, comprising a ceramic insulator body, a metal pin and a metal cap, wherein the metal pin and the metal cap are coaxially assembled with the ceramic insulator body through adhesive material, and the adhesive material comprises an expansion agent and a toughening agent;

• the expansion agent is configured to make the adhesive material expand after hardened so as to create a prestress between the ceramic insulator body and the metal pin and between the ceramic insulator body and the metal cap;
• the toughening agent comprises:
• 72-82 wt % of alpha-alumina (α-Al2O3), 15-22 wt % of yttrium-stabilized zirconia with yttrium oxide in a mole fraction of 8%, and 3-7 wt % of a flux;
• the flux is one or more selected from a group consisting of calcium carbonate, silicon dioxide and magnesium carbonate;
• and the toughening agent is prepared by firing at 1,610° C., crushing, and sieving, with a particle size of 0.30-0.35 mm;
• the adhesive material has a formula comprising following components by mass:
• 35-50 parts of modified cement, 20-35 parts of the toughening agent, 5-8 parts of the expansion agent, 2-6 parts of silica fume, 0.5-2.0 parts of an additive, and the adhesive material is doped with 2-2.5 vt % of a reinforced fiber;
• the modified cement is prepared from a mixture comprising 85-90 wt % of Portland cement P.II525 and 10-15 wt % of sulfoaluminate cement;
• the Portland cement P.II525 has a specific surface area of 330-350 m2·kg−1, while the sulfoaluminate cement has a specific surface area of 510-550 m2·kg−1;
• and the mixture has a particle size of D50=1.5-2.3 μm;
• the expansion agent has a chemical composition of 83-86 wt % of magnesium oxide, 4-6 wt % of calcium oxide, 5-8 wt % of silicon dioxide, and 1-3 wt % of other component;
• and the other component is one or more selected from a group consisting of alumina, sulfur trioxide, and iron oxide;
• the additive comprises a water reducer and a defoamer;
• the water reducer is JH-16 polycarboxylate superplasticizer, with a pH of 5-7 and a specific weight of 1.02-1.05;
• and the defoamer is a water-based active mineral oil defoamer, with a volatile organic compounds (VOC) content less than 0.1% and a solid content of 100%;
• the reinforced fiber is a polypropylene fiber or a nylon fiber, with a strength of 106-115 cN/dtex and a length of 3-5 mm;
• and
• assembly interfaces of the ceramic insulator body, the metal cap, and the metal pin to be assembled with the adhesive material are coated with a primer.