140 results about "Corrosive chemical" patented technology

The present methods provide tools for growing conformal metal thin films, including metal nitride, metal carbide and metal nitride carbide thin films. In particular, methods are provided for growing such films from aggressive chemicals. The amount of corrosive chemical compounds, such as hydrogen halides, is reduced during the deposition of transition metal, transition metal carbide, transition metal nitride and transition metal nitride carbide thin films on various surfaces, such as metals and oxides. Getter compounds protect surfaces sensitive to hydrogen halides and ammonium halides, such as aluminum, copper, silicon oxide and the layers being deposited, against corrosion. Nanolaminate structures incorporating metallic thin films, and methods for forming the same, are also disclosed.

The present method provides tools for growing conformal metal nitride, metal carbide and metal thin films, and nanolaminate structures incorporating these films, from aggressive chemicals. The amount of corrosive chemical compounds, such as hydrogen halides, is reduced during the deposition of transition metal, transition metal carbide and transition metal nitride thin films on various surfaces, such as metals and oxides. Getter compounds protect surfaces sensitive to hydrogen halides and ammonium halides, such as aluminum, copper, silicon oxide and the layers being deposited, against corrosion. Nanolaminate structures (20) incorporating metal nitrides, such as titanium nitride (30) and tungsten nitride (40), and metal carbides, and methods for forming the same, are also disclosed.

A heater arrangement such as a heating band is especially suitable for providing freeze protection for water pipes in an aircraft, because it is resistant to vibrations, greatly varying temperatures, low pressure conditions, and aggressive chemicals, while achieving a reliable seal against the penetration of moisture or liquid into the areas of the electrical connections. The heater arrangement includes a heating element with a heater band matrix and heating conductors extending therein, as well as a fluoropolymer protective layer thereover. A connecting element or a terminating element is connected to exposed ends of the heating conductors. To seal the area at which the connecting element or terminating element is connected to the heater arrangement, a fluoropolymer is extruded over this area, and/or a fluoropolymer molded part is used as a connection block or end cap. The fluoropolymer materials are thermally fused together to form a continuous integral seal.

An improved fluoroplastic lined elastomeric tube that can maintain a stable flow rate while pumping aggressive chemicals in a peristaltic pump for an extended period of time and is fabricated in sizes ranging from 0.5 mm to 100 mm in inside diameter. The inner fluoroplastic liner comprises a composite of expanded polytetrafluoroethylene and a fluoroplastic polymer resulting in improved flex life over single component fluoroplastics. The inventive liner is bonded to either an unreinforced elastomer or a fiber reinforced elastomer for use in both low and high pressure peristaltic pump applications.

An abrasive diamond composite (60) formed form coated diamond particles (10) and a matrix material (22). The diamonds (12) have a protective coating (14) formed from a refractory material having a composition MCxNy, that prevents corrosive chemical attack of the diamonds by the matrix material (22). The abrasive diamond composite (60) may further include an infiltrant, such as a braze material (40). Alternatively, the abrasive diamond composite (60) may include a plurality of coated diamond particles (10) and a braze material (40) filling interstitial spaces between the coated diamond particles (10). Methods of making such abrasive diamond composites (60) are also disclosed.

A method and apparatus using electromagnetic radiation and gas to create oxidation and reduction reactions on a device, such as a semiconductor wafer surface. In one embodiment, a scanned laser and gas may be employed in a number of oxidation and/or reduction reactions in a single system without using multiple pieces of equipment, corrosive chemicals and gases, high temperature and pressure chamber environments, waste treatment processes, and/or extra process steps typically required in existing processes.

The invention relates to the technical field of microwave application and discloses a dielectric constant measuring device which is not only used for measuring dielectric constant of a solid dielectric material but also used for measuring corrosive chemical solution dielectric constant. The dielectric constant measuring device comprises a groove structure. Signal interfaces are arranged at two ends of the groove structure and used for connecting a testing instrument and transmitting a testing signal. A hole is formed in the groove structure and located in a groove and used for placing a container for containing tested materials. The hole is large enough in size so that the tested materials contained in the container matched with the hole can fully affect the transmission property of the groove structure. The dielectric constant measuring device is simple in structure and high in sensitivity. A double-interface measuring method can avoid multiple solutions and is favorable for improving measuring precision and speed. The dielectric constant measuring device can be used for measuring the corrosive chemical solution dielectric constant, can achieve broadband measuring and online measuring and has wide applicability.

Disclosed are methods of treating and protecting teeth against erosion by use of oral compositions comprising polymeric mineral surface active agents, metal ions such as stannous and zinc and combinations thereof. The present methods provide improved resistance of teeth to erosive demineralization or dissolution and prevention of tooth damage by subsequent exposure of teeth to erosive chemicals such as acidic foods and beverages.

The invention belongs to the field of a solar battery manufacture process, in particular to a crystalline silicon solar battery edge etching process, which comprises the steps of edge etching and residue removal. The invention adopts a corrosive chemical pulp spray coating method for etching the edge of a silicon chip, the etching amount of the periphery of the silicon chip surface can be controlled within 0.2 mm, the PN junction loss of the silicon chip surface can be greatly lowered, the light absorption of the light absorption surface of the silicon chip can be improved, the photoelectric efficiency of batteries can be improved, the process is stable, and the control is easy.

The invention discloses a composite rubber hose for conveying LPG, LNG and strongly corrosive chemical solvent and a preparation method thereof. Low density polyethylene, ultra-high molecular weight polyethylene and macromolecule cross-linked polyethylene serve as raw materials; after scientific compound and vulcanization of a rubber hose, a chemical substance with a good adhesive property is obtained for preparing a liner film; meanwhile, corona treatment is carried out on the bonding face of the liner film and the bonding face of the rubber hose, and fiberglass reinforcing fiber with radiation protection performance is compounded on the surface layer; therefore, the surface layer of the rubber hose has good radiation protection performance, hidden danger of conveying pipelines caused by ionizing radiation is avoided, and finally the composite rubber hose which has the firmly bonded liner film, and is high in radiation protection and capable of conveying LPG, LNG and strongly corrosive chemical solvents is prepared, the hose can absorb as much as 97.5% to 99.5% of X-rays, gamma-rays and various neutrons in nuclear radiation, and the adhesive force (N/25mm) between the liner film and a rubber layer reaches 160-180.

The invention provides a method for preparing a boron nitride nanosheet by using a eutectic salt to strip boron nitride powder at high temperature. The method comprises following steps: grinding and mixing sodium chloride/potassium chloride eutectic salt with boron nitride powder, thermally treating at high temperature, and preparing in steps such as ultrasonic treatment, filtering, cleaning and drying to obtain the boron nitride nanosheet. The stripping method provided by the invention enables the preparation of a boron nitride nanosheet which is high in aspect ratio (that is large in lateral dimension and small in thickness), low in defect quantity and complete in structural features, and this method is suitable for batch production, does not relate to the use of toxic corrosive chemical reagents and is easy to perform.

The invention provides clean water and a method for preparing the same. The method for preparing the clean water includes steps of S10, sequentially carrying out aeration treatment by the aid of aeration layers on water, filtering the water by the aid of iron and manganese sand layers, filtering the water by the aid of quartz sand layers, filtering the water by the aid of activated carbon layers, then carrying out refined filtration, ultra-filtration and nano-filtration on the water and reserving the water for standby application; S20, arranging the water in alternating electromagnetic fields with the frequencies of 20,000-30,000 hertz to obtain magnetized water; S30, electrolyzing the magnetized water. The clean water and the method have the advantages that surfactants and irritant or corrosive chemical reagents are omitted in clean water production procedures, and accordingly the clean water is colorless and tasteless and is free of additives, irritation, corrosion, foam, residues and hand injury; fruits, vegetables, uncooked and cooked foods and tableware can be effectively cleaned, excellent effects of dispersing, suspending and washing grease and fine sundry particles can be realized, and heavy metal and certain pesticide toxin can be removed by means of electrostatic attraction; the clean water is free of skin allergy and irritation, and certain whitening and moisturizing effects can be realized by the clean water.

The invention provides a stripping solution for preparing a two-dimensional nanomaterial and application thereof. The stripping solution comprises the following components: an alcohol substance with the volume content of 0.05-59%, a methyl-containing organic solvent with the volume content of 0.03-8%, a fused ring compound with the concentration of 0.01mg/L-1g/L and the balance of water. The invention further provides application of the stripping solution. The stripping solution provided by the invention uses liquid water as a main body, so that the defects that the organic solvent is flammable and explosive are avoided, the cost is reduced, and use of strong acids and strong corrosive chemical reagents is avoided; layered solid particles are dispersed in the stripping solution, and underthe actions of mechanical shearing and ultrasonic, stripping of the layered solid particles into two-dimensional nanoflakes can be effectively accelerated, so that secondary aggregation of the two-dimensional nanoflakes is avoided.

Semiconductor substrates, particularly metallized substrates such as partially processed wafers, are rinsed with an aqueous medium, preferably deionized water, which further contains an anti-corrosive chemical agent or agents selected so as to minimize corrosion of metals resulting from contact with the water. The amount of anti-corrosive chemical agent is maintained in a controlled manner at a predetermined level or within a predetermined range preferably the rinsing with aqueous medium containing anticorrosive chemical agent is also carried out for a specified time, followed by further rinsing with deionized water alone. The rinsing may be combined, either in the same vessel or in a different vessel, with a subsequent drying step, such as a drying process utilizing a drying vapor introduced into the rinse tank or into a downstream vessel. The drying vapor condenses on the surface of the semiconductor material and reduces the surface tension of residual process fluid, causing the residual process fluid to flow off the surface.

A manufacture method of a chemicals independent cargo hold in a hull is characterized by including the steps of designing drawing stock, and directly manufacturing stainless steel parts to be machined, in a manufacturer; scribing steel material, cutting and blanking; cold-machining the stainless steel parts; assembling and welding the stainless steel parts cold-machined; assembling and welding section by section; assembling an independent cargo hold; launching after pickling-passivation tightness test. The stainless steel parts are directly manufactured by the stainless steel manufacturer, so that expenditure on purchasing machining equipment is greatly saved, management cost is reduced, and construction period is short; in addition, the parts, in contact with liquid cargoes, of both side of the cargo hold are made of double-phase stainless steel, the part, in contact with the liquid cargoes, of one side of the cargo hold is made of stainless steel composite plates, and accordingly the cargo hold has high strength and corrosion resistance and the cost is saved; the process is reasonable, manufacture period is short, the cost is low, the manufactured independent cargo hold is high in strength, high in tightness and resistant to corrosion, and the needs for carrying high-corrosive chemicals are met.

The invention discloses corrosive chemical liquid used for corrosion of silicon magma on the surface of silicon chips. The corrosive chemical liquid comprises the following components, by volume percentage, 40 to 43% of an aqueous solution of NH4F, 8 to 10% of an aqueous solution of HF and 48 to 52% of H2O2. The corrosive chemical liquid has a strong corrosion effect and a stable corrosion rate, and enables the goal of corroding silicon magma on the surface of silicon chips to be realized; preparation of the corrosive chemical liquid is convenient and has the advantage of strong repeatability; the invention also discloses a method of corroding silicon magma with the corrosive chemical liquid, and the method has the advantages of a simple process, easily controllable reaction process and low cost.

The invention discloses a solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and a preparation method thereof. The method comprises steps as follows: a mixed liquid of a reduced graphene oxide aqueous solution and ammonia water A flows through a porous supporting membrane, reduced graphene oxide is deposited on the porous supporting membrane, and the composite nanofiltration membrane is obtained; the mixed liquid flows through the porous supporting membrane under the action of pressure. According to the method, the preparation process is simple and easy to implement, the cost is relatively low, the porous supporting membrane used in the method is a microfiltration membrane at the relatively low price, and, however, ultrafiltration membranes in the relatively high price are frequently used in the prior art. A graphene composite nanofiltration membrane organic solvent prepared with the method is high in flux and has the organic dye rejection rate close to 100%. A separation layer of the graphene composite nanofiltration membrane prepared with the method comprises solvated graphene and has very good resistance to various organic solvents and corrosive chemical environments.

The invention discloses a flange sealing gasket for chemical sewage pipe connection and relates to the technical field of sealing material production. The flange sealing gasket is prepared from raw materials in parts by mass as follows: 80-90 parts of NBR (nitrile butadiene rubber), 12-15 parts of nano glass fibers, 20-25 parts of polyphenylene sulfide, 15-20 parts of polyvinyl alcohol, 10-12 parts of kaolin, 8-11 parts of carboxymethyl chitosan, 5-8 parts of white carbon black, 4-7 parts of guar gum, 3-5 parts of sodium stearate, 1-3 parts of an anti-aging agent, 20-25 parts of polyethylene glycol and 25-30 parts of water. The NBR is modified with the nano glass fibers, multiple aids are used, the comprehensive performance of the sealing gasket is improved, and the prepared sealing gasket is applicable to corrosive chemical sewage at the temperature lower than 198 DEG C and is long in service life.

Cleaning compositions and methods of use thereof for cleaning fryers and other hard surfaces soiled by grease, shortening, oils and other soils commonly encountered in the food service industry are disclosed. Cleaning compositions and methods of use which beneficially remove soils from vertical and/or inverted surfaces, reduce the cleaning time required for removing such difficult to remove and baked on soils, reduce exposure to hot surfaces by allowing cleaning at or near room temperature, reduce exposure to caustic chemicals, and/or eliminate the need for personal protective equipment (PPE) for use of the cleaning compositions are disclosed.

The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene. The operation steps of the method are as follows: after the graphite powder is pressurized in a pressure vessel, the graphite powder is rapidly decompressed to expand it to obtain graphene; and the above-mentioned expansion operation is repeated until the required number of layers of graphene is obtained. In the optimized scheme, the expanded graphene is added into a volatile dispersant for grinding and dispersing. The invention has simple processing technology, short production cycle, and is suitable for large-scale industrial production. Strong oxidizing and strong corrosive chemicals are not used in the process, which greatly reduces the hazards to operators and the risk of environmental pollution during the production process, and also The production cost can be greatly reduced.