33 results about "Crystalline quartz" patented technology

A cardiac pacemaker, other CRT device or neurostimulator has one or more fine wire leads. Formed of a glass, silica, sapphire or crystalline quartz fiber with a metal buffer cladding, a unipolar lead can have an outer diameter as small as about 300 microns or even smaller. The buffered fibers are extremely durable, can be bent through small radii and will not fatigue even from millions of iterations of flexing. Bipolar leads can include several conductors side by side within a glass / silica fiber, or can be concentric metal coatings in a structure including several fiber layers. An outer protective sheath of a flexible polymer material can be included.

Disclosed are silica powder for wood lacquer transparent finishing paint and a preparation method of the silica powder. The method comprises the steps that firstly, high-purity crystalline quartz sandis magnetically separated, the magnetically-separated high-purity crystalline quartz sand is crushed by airflow crushing equipment, a modifier is added for modification during crushing, and after modification is completed, the material is classified by an airflow classifier to obtain the silica powder with D50 equal to 2.0-7.0 micrometers and D100 smaller than or equal to 25.0 micrometers, wherein the silica powder is the silica powder for the wood lacquer transparent finishing paint. By means of the method, the high-purity crystalline quartz sand with specific particle size and specific components is used as a raw material, the silica powder product with specific particle size distribution, a small specific surface area, a regular particle shape and high purity is prepared through airflow crushing, the process flow is simple, the wood lacquer transparent finishing paint obtained by applying the product is good in transparency and handfeel, easy to disperse and unlikely to settle, andthe silica powder can be used for improving the hardness and scratch resistance of a paint film and is suitable for the wood lacquer transparent oily finishing paint, water-based finishing paint, other transparent finishing paint, primer, transparent adhesives and the like.

The invention discloses a five-layer composite quartz crucible for a large-scale integrated circuit and a preparation method and surface treatment method thereof, and belongs to the technical field ofquartz crucible processing and treatment. The five-layer composite quartz crucible is composed of five layers of quartz, the thickness is decreased successively from outside to inside, and the five layers of quartz include outer layer natural quartz, inner layer natural quartz, semi-crystalline quartz, microcrystalline synthetic quartz and inner layer synthetic quartz successively, the outer layer natural quartz and inner layer natural quartz are both made from high bubble natural quartz, the semi-crystalline quartz is made from low bubble quartz, and no bubbles are in the microcrystalline synthetic quartz and the inner layer synthetic quartz; the microcrystalline synthetic quartz contains 0.15% of mixed rare earth which is lanthanum-cerium mixed rare earth, the inner layer synthetic quartz contains 0.11% of biphasic toughening copolymer, and the diphasic toughening copolymer includes the following components of: Ni, Mn, N, Cu, Ag, Co and Fe. The problems of large internal stress, poor temperature resistance and low service life of a quartz crucible in the prior art are solved.

A method of fabricating a resonator includes providing a first quartz substrate, forming a metallic etch stop on a first surface of the first quartz substrate; attaching, using a temporary adhesive, the first surface of the first quartz substrate to a second quartz substrate, etching an opening for a via in a second surface of the first quartz substrate to the metallic etch stop, forming a metal electrode on the second surface of the first quartz substrate, the metal electrode penetrating the via in the first quartz substrate to make ohmic contact with the metallic etch stop, bonding the metal electrode formed on the second surface of the first quartz substrate to a pad formed on a host substrate; and dissolving the temporary adhesive to release the second quartz substrate from the first quartz substrate, wherein the first quartz substrate and the host substrate each comprise crystalline quartz.

The invention relates to a method for preparing a high-purity spraying-free coating at the bottom of an ingot casting single crystal. The method comprises the following steps: grinding fused quartz particles and deionized water in a ball mill, taking the resulting product out, adding the resulting product in a dispersion machine, adding silica sol, fused quartz powder, fused quartz powder and a high-purity ceramic binder, and stirring the mixture to form slurry A; adding fused quartz particles and deionized water into the ball mill for milling, taking the resulting product out, adding the resulting product into a stirrer, adding silica sol and fused quartz powder, and stirring the mixture to form slurry B; adding fused quartz particles and crystalline quartz in the ball mill for milling, taking the resulting product out, and mixing quartz slurry, silica sol, a binder and water to form slurry C; adding silicon nitride and deionized water to the stirrer, adding a silicon nitride sintering aid, silica sol and a high-purity binder, and fully stirring the mixture to form slurry D; and sequentially manufacturing a bottom lining flat layer, a rough loose layer, a quartz compact isolationlayer and a silicon nitride compact isolation layer. The method can effectively reduce a red area at the bottom of the ingot casting single crystal, and can reduce the proliferation of dislocation andother defects.

Durable fine wire electrical conductors are robust, durable, small in profile, and light weight, yet capable of operating under extreme environmental conditions. Formed of a glass, silica, sapphire or crystalline quartz fiber core with a metal coating and one or more polymer layers, a unipolar electrical conductor can have an outer diameter as small as about 300 microns or even smaller. The metal buffer coating may be deposited directly on the glass / silica fiber, or upon an intermediate layer between the glass / silica fiber and metal, consisting of carbon and / or polymer. The resulting metallized glass / silica fibers are extremely durable, can be bent through small radii and will not fatigue even from millions of iterations of flexing. Bipolar electrical conductors can include several insulated metallized glass / silica fibers residing side by side, or can be coaxial with two or more insulated metal conductive paths. An outer protective sheath of a flexible polymer material can be included.

The invention discloses a five-layer composite quartz crucible for a large-scale integrated circuit and a preparation method and surface treatment method thereof, and belongs to the technical field ofquartz crucible processing and treatment. The five-layer composite quartz crucible is composed of five layers of quartz, the thickness is decreased successively from outside to inside, and the five layers of quartz include outer layer natural quartz, inner layer natural quartz, semi-crystalline quartz, microcrystalline synthetic quartz and inner layer synthetic quartz successively, the outer layer natural quartz and inner layer natural quartz are both made from high bubble natural quartz, the semi-crystalline quartz is made from low bubble quartz, and no bubbles are in the microcrystalline synthetic quartz and the inner layer synthetic quartz; the microcrystalline synthetic quartz contains 0.15% of mixed rare earth which is lanthanum-cerium mixed rare earth, the inner layer synthetic quartz contains 0.11% of biphasic toughening copolymer, and the diphasic toughening copolymer includes the following components of: Ni, Mn, N, Cu, Ag, Co and Fe. The problems of large internal stress, poor temperature resistance and low service life of a quartz crucible in the prior art are solved.

The invention relates to a preparation method of ultrafine silicon micropowder for chip-type discrete devices. The superfine silicon micropowder is used as a filler for chip-type discrete devices. The preparation steps are as follows: select SiO 2 High-purity crystalline quartz sand with a content ≥99.0% is used as the raw material; the raw material is fed into the drum ball mill for grinding after magnetic separation, and the ground material is then classified by the air classifier to obtain D50=1.5-3.5μm, D90=5 ‑8 μm, D 100 = 11-16μm ultra-fine silica powder, used for silicon powder filling of SMD discrete devices. The method of the invention can prepare a silicon micropowder product with specific particle size distribution, regular particle shape and high purity. The product has reasonable particle size distribution, low product viscosity, increased fluidity of epoxy plastics, and improved overflow characteristics. In the SMD discrete device package, the wettability with the chip is better, which effectively solves the electrical problem caused by delamination.

The invention discloses high-temperature ceramic glaze for a large casting sintering furnace door brick. The high-temperature ceramic glaze comprises, by weight, 5 to 8 parts of feldspar, 40 to 45 parts of spodumene powder, 20 to 30 parts of fused silica powder, 7 to 13 parts of alpha-alumina micro-powder, 5 to 10 parts of raw talcum powder, 2 to 5 parts of zirconium dioxide, 2 to 5 parts of zinc oxide and 48 to 70 parts of water. The invention also discloses a preparation method of the high-temperature ceramic glaze for a large casting sintering furnace door brick. Zirconium dioxide in the raw materials is precipitated in a form of zirconite crystals, the fused silica powder is partially converted into crystalline quartz, and the spodumene powder forms the beta-spodumene solid solution. Under the accurate temperature control condition, thermal insulation time is prolonged and a large amount of the beta-spodumene solid solution is precipitated so that the expansion coefficient of glaze is decreased, good density is obtained, air permeability is greatly reduced and the damage caused by carbon and harmful substances into a furnace door brick in the work process is avoided by the glaze.

A pressure transducer comprising a flexible member made of amorphous quartz and a crystalline quartz sensor are coupled together without an adhesive material. Instead, the amorphous quartz and the crystalline quartz sensor are coupled together at the molecular level. In some embodiments, the crystalline quartz sensor remains in compression or tension during the entire operating range of the pressure transducer. In one embodiment, the crystalline quartz sensor is pre-stressed in either compression or tension when the pressure transducer is exposed to atmospheric pressure. In one embodiment, pressure transducer is located in pressure stabilizing system.

A system is used to perform fast and slow applications, for example fast application can be pulse trimming. The system includes a radiation source, an electro-optical modulator, and a beam splitter. The radiation source is configured to generate a polarized beam of radiation. The electro-optical modulator, formed of crystalline quartz, is configured to modulate the beam of radiation. The beam splitter is configured to direct a first portion of the beam to a beam dump and to form an output beam from a second portion of the beam.

The present invention relates to a composite crystal granite slab, which has a substrate layer. The key point is that: the substrate layer is compounded with a crystal granite decorative layer, and the substrate layer is provided with a plurality of longitudinal ridges and a plurality of transverse ridges. The substrate layer is composed of fiber cloth or non-woven fabric and unsaturated resin, the crystal granite decorative layer is formed by mixing and curing quartz sand and resin, and a metal frame is set on the periphery of the crystal granite plate. The invention has beautiful appearance, waterproof and acid and alkali resistance, and can be used for decoration of walls, ceilings, floors and furniture.

An Au—Sn—Ag-based solder alloy for high temperature use containing Sn, Ag, Au and elements that are inevitably contained owing to manufacture procedure, wherein the Au—Sn—Ag-based solder alloy has a composition adjusted so that a solidus temperature is within a range of 280 to 400° C. with a gap between the solidus temperature and the liquidus temperature being within 40° C. The Au—Ag—Sn-based solder alloy has low cost, and is excellent in solderability, reflow wettability and reliability. The excellent reflow wettability of the Au—Ag—Sn-based solder alloy allows it to be useful in reflow bonding of crystal quartz devices, SAW filters and MEMS.

The invention relates to the field of preparation of new materials, in particular to a calcining method for high-purity silica sand. The calcining method for the high-purity silica sand mainly comprises the following steps: coarse grinding, strong magnetic selection, reverse flotation, roasting, acid leaching and vacuum calcining. The invention discloses the calcining method for the high-purity silica sand. According to the scheme, vein quartz mineral raw materials which are abundant in China are utilized, ultra-high-purity crystal quartz is prepared, and the calcining method for the high-purity silica sand has the characteristics of low price and stable process.