摘要:
A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets, having superior properties.
摘要:
A method for integrating several petroleum refining processes so as to efficiently produce tertiary alkyl ether compounds from a feed stream containing both saturated and unsaturated hydrocarbons is disclosed. An important step for forming isoolefins in the integrated process involves simultaneous catalytic conversion of an isoparaffin to an isoolefin and an n-olefin to an n-paraffin in a combination hydrogenation/dehydrogenation reactor. The thus produced isoolefin is reacted with a primary alcohol to form the desired tertiary alkyl ether compound in an ether forming process. Other conversion process included in the overall integration are an isomerization process to convert n-paraffins to isoparaffins and optionally an alkylation process to convert isoparaffins and olefins to an alkylate product.
摘要:
A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets, having superior properties.
摘要:
An iron-chromium-cobalt magnetic alloy characterized by good magnetic quality, improved hot and cold ductility and by a reduction in the minimum temperature for complete solutioning; and processing for producing said alloy. Hot ductility is improved through controlled additions of rare earth elements in conjunction with modified refining. Cold ductility is improved through a rapid cool subsequent to hot working and prior to cold working. Solutioning temperatures are lowered through controlled additions of vanadium and titanium.
摘要:
A process is provided to stabilize and/or reactivate an olefin production catalyst system which comprises contacting an olefin production catalyst system, either before or after use, with an aromatic compound.
摘要:
A process is provided to stabilize and/or reactivate an olefin production catalyst system which comprises contacting an olefin production catalyst system, either before or after use, with an aromatic compound.
摘要:
An improved apparatus useful in a process for separating a liquid stream (which can be an HF catalyst mixture) having a first liquid component (which can be HF), a second liquid component (which can be light ASO) and a third liquid component (which can be heavy ASO) is disclosed. The apparatus includes a closed vessel including an upper portion, a lower portion, and an intermediate portion, and above a bottom tray contained therein having a downcomer extending downwardly therefrom. The apparatus also includes a conduit located within the downcomer and opening below the level of the bottom tray.
摘要:
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.
摘要:
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.003 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips are prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip.
摘要:
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.