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38 results about "Moissanite" patented technology

Moissanite (/ˈmɔɪsənaɪt/) is naturally occurring silicon carbide and its various crystalline polymorphs. It has the chemical formula SiC and is a rare mineral, discovered by the French chemist Henri Moissan in 1893. Silicon carbide is useful for commercial and industrial applications due to its hardness, optical properties and thermal conductivity.

Gem tester using electrical photoconductivity

Diamond look-alikes like cubic zirconium, moissanite and other synthetic stones, are distinguishable from nature diamonds based on their thermal and / or electrical conductivities. Germ testers that are on the market are capable of evaluating these two parameters as is the present invention. Electrical resistance of moissanites reaches hundreds of thousands megohms. Existing gem esters use test voltage of 1000 volts, to be able to detect electrical conductivity in most moissanites. Still, reliable detection of high resistance moissanites is difficult. Proposed invention uses significant photo conductivity of moissanites, which was observed by the inventors, to facilitate measurement of electrical conductivity in the toughest gems, to reduce test voltage applied to gems to 300 volts, and to limit electrical test current through a gem to no more than a few micro-amps. Other refinements include: (1) multistep evaluation of electrical conductivity, which avoids applying excessive or unnecessary test voltage and current to a gem, (2) circuit design, which efficiently attenuates AC noise, (3) signal processing, which eliminates industrial pick-up, (4) usage of reference temperature sensor, which improves sensibility and repeatability of thermal measurements.
Owner:TRI ELECTRONICS

Preparation method of blue mullite

The invention discloses a preparation method of blue mullite. The preparation of the blue mullite is realized by doping metallic aluminum or an aluminum-containing compound; a secondary crystallization method is combined with an inner crucible device to control the uniformity of the doped metallic aluminum so as to obtain blue mullite with uniform color. The preparation method comprises the following steps of: firstly, fully mixing high-purity silicon carbide powder with doped metallic aluminum or aluminum-containing compound; selecting polycrystalline mullite as a seed crystal in a crystal growth furnace to grow doped polycrystalline mullite by a physical vapor transport method; taking out the polycrystalline mullite, breaking and putting the polycrystalline mullite into an inner crucible; putting high-purity silicon carbide powder into the bottom of an outer crucible; selecting monocrystal mullite as a seed crystal to be subjected to physical vapor transport growth again, so as to obtain blue mullite with uniform color. The aluminum and silicon carbide powder are combined in the first growth, the aluminum is slowly released along with the gasification of the silicon carbide in the second growth process, and therefore, the aluminum uniformly enters the mullite, and color uniformity control is achieved.
Owner:NANTONG UNIVERSITY

Branch iron runner pouring material of 850m<3> blast furnace

The invention relates to a branch iron runner pouring material of an 850m<3> blast furnace and belongs to the field of fireproof pouring materials. The pouring material comprises the following components in parts by weight: 48-56 parts of moissanite, 1-8 parts of CeO2, 3-10 parts of metal silicon powder, 10-25 parts of zinc-aluminum spinel powder, 10-15 parts of a waste smelting furnace shell, 3-10 parts of SrTiO3 powder, 1-2 parts of Guangxi mud, 1-5 parts of silicon nitride powder, 0.1-0.2 part of sodium tripolyphosphate, 0.05-0.2 part of styrene maleic anhydride and 3-8 parts of aluminum sol suspension liquid, wherein the waste smelting furnace shell is a furnace shell for producing graphite and mainly comprises 50%-68% of SiC and 18%-30% of C. A blast furnace iron runner prepared from the pouring material has the characteristics of good thermal shock property, good corrosion and stripping resistance, large iron flux and long service life.
Owner:SUZHOU FABAI TEXTILE CO LTD

Identification device for distinguishing natural diamonds, synthetic diamonds and moissanite based on reflection method

The invention discloses an identification device for distinguishing natural diamonds, synthetic diamonds and moissanite based on a reflection method. The identification device comprises a lower cover, a middle frame and an upper cover. And a circuit board is arranged in the lower cover and is also connected with an ultraviolet light source and an ultraviolet spectrograph. The ultraviolet light source comprises a first light source and a second light source, the wavelength of the first light source is 250nm-280nm, and the wavelength of the second light source is 350nm-390nm. A Y-shaped optical fiber tube is further arranged in the lower cover, the first end of the Y-shaped optical fiber tube is right opposite to the ultraviolet light source, the second end of the Y-shaped optical fiber tube is connected with the ultraviolet spectrometer, and the third end of the Y-shaped optical fiber tube penetrates out of the middle frame and abuts against the surface of the diamond to be identified. The device has the beneficial effects that the device can quickly and accurately distinguish natural diamonds, synthetic diamonds and moissanite, and the distinguishing accuracy can reach 99% or above. Moreover, the device is small in overall size, convenient to carry, simple to operate, low in manufacturing cost and particularly suitable for diamond manufacturers, jewelry manufacturers, detection stations and the like with large usage amounts.
Owner:SHENZHEN FABLE JEWELRY TECH +1

High pressure and crack resistant glass micro-bead for use in reflection film and method for preparing same

The present invention discloses a high pressure and crack resistant glass micro-bead for use in a reflection film and a method for preparing same. The glass micro-bead is prepared using the following raw materials based on part by weight: 24 to 38 parts of quartz powder, 14 to 26 parts of fluorite, 18 to 32 parts of zircon sand, 15 to 25 parts of corundum sand, 6 to 12 parts of :manganese dioxide, 5 to 10 parts of aluminum borate whisker, 16 to 28 parts of moissanite, 10 to 15 parts of nano barium sulfate, 12 to 24 parts of lazialite, 3 to 6 parts of tin dichloride, 4 to 8 parts of sodium carbonate, 3 to 5 parts of charcoal powder, and 5 to 8 parts of additive. According to the present invention, with addition of zircon sand and corundum sand, the pressure resistance strength of the glass micro-bead is improved, and with addition of aluminum borate whisker and nano barium sulfate, the anti-ageing and crack resistant properties of the glass micro-bead is improved. The glass micro-bead prepared according to the present invention has the characteristics of high pressure resistance and anti-cracking property, and is thus gains a broad application prospect in the reflection film.
Owner:HEFEI DINGLIANG OPTICAL TECH

Identification device for distinguishing natural diamond, synthetic diamond and moissanite based on transmission method

The invention discloses an identification device for distinguishing natural diamonds, synthetic diamonds and moissanite based on a transmission method. Herein, an accommodating cavity is enclosed by a base and a bottom plate, a battery, a main control board and a circuit board are arranged in the accommodating cavity, and an ultraviolet receiver is arranged on the circuit board; an accommodating through hole for placing a to-be-identified diamond is formed in the base and is opposite to the ultraviolet receiver; a light shield is hinged to the base, an ultraviolet light source connected with the circuit board is arranged in the light shield and comprises a first light source and a second light source, the wavelength of the first light source ranges from 250 nm to 280 nm, and the wavelength of the second light source ranges from 350 nm to 390 nm. The device has the beneficial effects that the device can quickly and accurately distinguish natural diamonds, synthetic diamonds and moissanite, the distinguishing accuracy can reach 99% or above, and the speed is high to identify one diamond per second. Moreover, the identification device is simple to operate, low in manufacturing cost and suitable for diamond manufacturers, jewelry manufacturers, detection stations and the like with large use amounts.
Owner:SHENZHEN FABLE JEWELRY TECH +1
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