821 results about "Magnesium fluoride" patented technology

A thermal spray composition and method of deposition for abradable seals for use in gas turbine engines, turbochargers and steam turbines. The thermal spray composition includes a solid lubricant and a ceramic preferably comprising 5 to 60 wt % total of the composition in a ratio of 1:7 to 20:1 of solid lubricant to ceramic, the balance a matrix-forming metal alloy selected from Ni, Co, Cu, Fe and Al and combinations and alloys thereof. The solid lubricant is at least one of hexagonal boron nitride, graphite, calcium fluoride, lithium fluoride, magnesium fluoride, barium fluoride, tungsten disulfide and molybdenum disulfide particles. The ceramic includes at least one of albite, illite, quartz and alumina-silica.

The invention provides a magnesium oxide ceramic foam filter for filtering a magnesium and magnesium alloy melt and a preparation method thereof, relating to the field of metallurgy. The process is as follows: a polyurethane foam template is soaked in sodium hydroxide solution (10%) for 30 minutes under the temperature of 50 DEG C and is then washed by water and dried; electric-melting magnesium oxide, magnesium fluoride and water are mixed in a ball-milling manner according to the mass ratio so as to obtain water-based dispersion slurry; the polyurethane foam template is soaked in the slurry, and bisque is obtained through repeated slurry dipping and centrifugal slurry throwing; the bisque is put into an oven; finally, the dried bisque is put into a high-temperature furnace, is heated to 1,200 to 1,300 DEG C at the speed of 1 to 3 DEG C / min, is heat-preserved for 2 hours, and is then naturally cooled in a furnace body. An obtained product of the invention has good chemical stability in the magnesium and the magnesium alloy melt, does not pollute the magnesium and the magnesium alloy melt, has good functions of absorbing and filtering nonmetallic inclusions in the magnesium and the magnesium alloy melt, and is suitable for filtering as well as purifying the magnesium and the magnesium alloy melt.

Provided is a broadband reflecting mirror that has a high reflectance in the band with wavelengths ranging from 400nm to 2,500nm, heat resistance, and flaw resistance. A broadband reflecting mirror (1) for reflecting light in a band with wavelengths ranging from 400nm to 2,500nm, is provided with a first reflecting stacked film (3) in which a first high refractive index material layer and a firstlow refractive index material layer are stacked alternately to reflect light with a band on a short wavelength side in the band with wavelengths ranging from 400nm to 2,500nm, a second reflecting stacked film (4) in which a second high refractive index material layer and a second low refractive index material layer are stacked alternately to reflect light with a band on a long wavelength side in the band with wavelengths ranging from 400nm to 2,500nm, wherein the broadband reflecting mirror is characterized in that the first reflecting stacked film (3) is arranged on the incident side of the light, while the second reflecting stacked film (4) is arranged at a position from which the light penetrating the first stacked film (3) can be reflected, and wherein the first high refractive index material layer is formed of at least one material selected from the group consisting of niobium oxide, titanium oxide, zirconium oxide, tantalum oxide, hafnium oxide, silicon nitride, yttrium oxide and indium tin oxide, the first low refractive index material layer is formed of at least one material selected from the group consisting of silicon oxide and magnesium fluoride, the second high refractive index material layer is formed of at least one material selected from the group consisting of silicon and germanium, and the second low refractive index material layer is formed of at least one material selected from the group consisting of silicon oxide and magnesium fluoride.