45results about How to "Improve structural toughness" patented technology

The invention relates to a low-carbonmagnesia carbon brick with a non-oxidereinforcing and toughening structure and a preparation method of the low-carbonmagnesia carbon brick. The low-carbonmagnesia carbon brick is prepared from raw materials in parts by weight as follows: 75-95 parts of fused magnesia, 5-20 parts of Si3N4 powder, 0-5 parts of metal aluminum powder and 3-5 parts of phenolic resin. The preparation method comprises steps as follows: components of the raw materials are weighed in proportion, raw materials whose granularity is smaller than or equal to 0.088 mm are premixed for 2-5 minutes, and premix is obtained; raw materials whose granularity is larger than 0.088 mm are stirred for 2-6 minutes, a phenolic resin binder is added and stirred for 1-5 minutes, the premix is added and stirred for 3-10 minutes, the mixture is pressed and formed under the pressure of 50-250 MPa, a product is subjected to heat treatment in a dry kiln at the temperature ranging from 100 DEG C to 300 DEG C, the content of carbon in prepared materials can be reduced to 3%, recarburizationof the magnesia carbon brick to molten steel is effectively prevented, meanwhile, a flaky or fibrousnon-oxidebonding phase is generated in situ in a substrate under the use condition, the material structure is improved, the reinforcing and toughening functions are realized, the thermal shock resistance and the slag corrosion resistance of material are improved while the carbon content is reduced, and the clean steel smelting condition is met.

The invention relates to a solid vacuum insulation ring network cabinet and a manufacturing method thereof. The ring network cabinet comprises a housing, a vacuum interrupter load switch, an isolator, three sets of fuses, a grounding device, a mechanical transmission device, and a bus. The vacuum interrupter load switch consists of an arc-extinguishing-flame-retardant-ceramic-made housing, a fixed power connection unit, a moveable power connection unit and a vulcanized silicone rubber. The arc-extinguishing flame retardant ceramic is further formed in such a way that a nano-alumina fiber is mixed with a silicon dioxide fiber and zirconium dioxide powder under high pressure and dense sintering. The housing is provided with an insulation elastic component, whose end head is connected with a tempered glass joint's elastic element. The gap part utilizes ethyl formate resin for insulation sealing. The isolator is of a three-joint structure with two joints connected with the bus and the other one connected with the grounding device. The solid vacuum insulation ring network cabinet proposed by the invention can realize the operation and linking of circuit disconnection, arc-extinguishing and isolation. The service lifetime of the cabinet is long and it can be used outdoors for a long time. The housing of the vacuum interrupter load switch is not easy to be deformed, does not go rusty and has a low expansion coefficient.