77results about How to "Reasonable thickness" patented technology

The invention discloses crystallizer protective slag for effectively controlling carbon steel cracks in a compact strip production (CSP). The crystallizer protective slag comprises the following chemical components in percentage by mass: 35 to 38 percent of CaO, 28 to 31 percent of SiO2, 1 to 3 percent of Al2O3, 1 to 2 percent of MgO, 0.5 to 1.5 percent of Fe2O3, 10 to 11.5 percent of F, 9 to 11.5 percent of Na2O, 1.5 to 3.5 percent of MnO, 5 to 8 percent of fixed carbon, and the balance of inevitable trace elements. Through the crystallizer protective slag for controlling the carbon steel cracks in the CSP, the alkalinity is improved by 0.04 to 0.09, the alkalinity is controlled to be 1.20 to 1.25, the constraint that the alkalinity cannot be more than 1.16 in the field is broken, the viscosity is controlled to be 0.08 to 0.09Pa.S, and the melting point is from 1,155 to 1,185 DEG C; capabilities of dissolving and absorbing inclusions are improved, and heat transfer is retarded by reducing a vitreous body, so that an aim of reducing longitudinal cracks is fulfilled; and by adjusting the proportioned carbon and controlling the thickness of a liquid slag layer, bonding steel leakage caused by high crystallization temperature and deteriorated lubricating performance due to over high alkalinity of the protective slag is relieved.

The invention relates to a thermal erosion test device for testing thermal protection materials for use in a solid propellant thruster. The device comprises a support for holding a plate made of the thermal protection material for testing so that its faces a face of a block of solid propellant, the space between the plate and the face of the propellant block defining a combustion chamber of substantially rectangular shape, said chamber extending along said plate and opening out into a nozzle.