摘要:
The invention pertains to a one step synthesis of 2-substituted benzo[b]thiophene of general formula wherein the synthesis of 2-substituted benzo[b]thiophenes is by reacting the starting materials substituted or unsubstituted 2-halogenobenzaldehyde and substituted or unsubstituted acetyl/phenacyl bromide with a catalyst, a sulphur source and phase transfer catalyst in an aqueous medium with atmospheric air and at temperature in the range of 25°C-30°C.
摘要:
The invention relates to a method for surface treatment of a doctor blade element made of a steel alloy, especially austenitic steel, for coating devices. According to the invention, the doctor blade element is subjected to a gas-plasma assisted treatment wherein the gas plasma contains nitrogen and carbon compounds and at least one noble gas, preferably argon. During the treatment, foreign metal foreign ions, especially titanium and molybdenum, are implanted directly in the steel surface of the doctor blade element.
摘要:
A method of immersing an iron member in a molten salt bath containing Li, Na and K as cation components and CNO and CO3 to form a nitride layer on the surface thereof, characterized in that one or more selected from among lithium hydroxide, sodium hydroxide and potassium hydroxide is further added to the molten salt bath, to thereby form a nitride layer on the surface of the iron member and simultaneously a iron lithium composite oxide layer on the uppermost surface thereof. A bath-preparing agent or a component-replenishing agent containing a hydrate or free water may be added to the molten salt bath in place of the sodium hydroxide or the like. The salt bath is preferably agitated with a wet air having (1 X 10 kg or more of H2O)/(1 kg of dry air). Li, Na and K components are preferably present in the salt bath in such a range that provides a mixture of carbonates of the three elements having a solidifying point of 500 DEG C or lower and the mole ratio of Na : K is preferably 2:8 to 8:2. CNO is preferably contained in an amount of 5 to 35 wt %. The accumulation of by-produced CN in the salt bath is preferably suppressed to a content of 2 wt % or less. The salt bath preferably has a temperature of 450 to 650 DEG C. The resultant iron member exhibits improved wear resistance and also improved corrosion resistance.
摘要:
There is provided a surface alloyed component which comprises a base alloy with a diffusion barrier layer enriched in silicon and chromium being provided adjacent thereto. An enrichment pool layer is created adjacent said diffusion barrier and contains silicon and chromium and optionally titanium or aluminum. A reactive gas treatment may be used to generate a replenishable protective scale on the outermost surface of said component.
摘要:
A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; providing a salt bath which includes sodium dioxide and a salt selected from the group consisting of sodium cyanate and potassium cyanate; dispersing metallic titanium formed by electrolysis of a titanium compound in the bath; heating the salt bath to a temperature ranging from about 43O°C to about 67O°C; and soaking the base material in the salt bath for a time of from about 10 minutes to about 24 hours. In accordance with another aspect of the present invention, titanium and nitride may be diffused into a base material without a coating. The treated base material may further be treated with conventional surface treatments or coatings.
摘要:
Chain parts and other steel articles are provided with hard, wear-resistant carbide coatings by tumbling them in a heated retort with a particulate mix which includes a source of vanadium and/or niobium. The steel substrate comprises a steel having at least 0.3 % carbon, preferably 0.7-1.2 %. Where the chromium content of the steel is 4-12 %, preferably 4-8 %, the chemical deposition process includes drawing a small amount of chromium from the steel substrate into the vanadium or niobium carbide coating, where it is distributed substantially homogeneously, helping to provide adhesion strength to the coating.
摘要:
A method of making heat engine components, such as rocket nozzle throats, includes forming a body having at least one surface, wherein the body is made of a refractory metal, and compressing a ceramic powder between a die and the at least one surface of the body, with sufficient heat and pressure to densify and thus form a solid ceramic coating on the at least one surface of the body. Nozzle throats made according to the invention have bodies made of refractory metals, such as tantalum, and ceramic coatings on the inner surfaces of the annular bodies, wherein the ceramic coatings are made of ceramic materials such as tantalum carbide.
摘要:
A sliding member having a chromium nitride film formed thereon, for improving sliding characteristics by specifying the compound form of chromium nitride and its orientation. A sliding member having a chromium nitride film formed on a sliding surface of a substrate, characterized in that chromium nitride has a Cr2N structure and the sliding surface is substantially parallel to a (002) plane of Cr2N.
摘要:
Aspects of the invention are related to an article comprising a low friction film and a method of forming the low friction film on a surface of the article. The low friction film may be formed by applying a mechanical finishing surface treatment to the surface and subjecting the surface to a friction reducing material which diffuses through the surface forming the self-regenerating low friction film. The low friction film comprises at least 1 atomic % of friction reducing material atoms based on the total atoms within the low friction film, such that the low friction film has a residual compressive stress larger than 10 MPa.