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1. 发明授权

US4048119A Heating element composition and method for preparing tube fillings of high electrical resistance from fused magnesium oxide for tubular electric heating elements 失效
标题翻译：用于管状电加热元件的熔融氧化镁制备高电阻管填料的加热元件组合物和方法
公开(公告)号：US4048119A
公开(公告)日：1977-09-13
申请号：US691956
申请日：1976-06-01
申请人： Gerd-Edzard Bockstiegel , Manfred Neidhardt , Gerhard Rehfeld
发明人： Gerd-Edzard Bockstiegel , Manfred Neidhardt , Gerhard Rehfeld
IPC分类号： H01B3/10 , H01C7/00 , H05B3/48 , H01B1/08
CPC分类号： H05B3/48 , H01B3/10
摘要： An electrical heating element composition comprising crystals of fused magnesium oxide improved by the inclusion of 0.05 to 5% by weight, based on the weight of said fused magnesium oxide, of an additive composition which has excellent lubricating properties in respect of the magnesium oxide crystals and reacts at 800.degree. to 1050.degree. C with active conductivity centers at the surface of one or more adjacent magnesium oxide crystals; an improvement in the preparation of an electrical heating element wherein a granular fused magnesium oxide composition is subjected to mechanical shaping and calcination which comprises employing as the electrical heating element composition a composition comprising crystals of fused magnesium oxide and 0.05 to 5% by weight, based on the weight of said fused magnesium oxide, of an additive composition which has excellent lubricating properties in respect of the magnesium oxide crystals and reacts at 800.degree. to 1050.degree. C with the active conductivity centers at the surface of one or more adjacent magnesium oxide crystals.
摘要翻译：一种包含熔融氧化镁晶体的电加热元件组合物，其通过以所述熔融氧化镁的重量计包含0.05至5重量％的添加剂组合物，所述添加剂组合物相对于氧化镁晶体具有优异的润滑性能，在一个或多个相邻的氧化镁晶体的表面处，在800至1050℃的反应中具有活性导电中心; 对电加热元件的制备进行改进，其中对颗粒状熔融氧化镁组合物进行机械成型和煅烧，该方法包括使用包含熔融氧化镁晶体和0.05-5重量％基础的组合物作为电加热元件组合物关于所述熔融氧化镁的重量，添加剂组合物相对于氧化镁晶体具有优异的润滑性能，并在800至1050℃下与一个或多个相邻的氧化镁晶体的表面上的活性导电中心反应。

2. 发明授权

US4177235A Method of manufacturing electrically fused corundum 失效
标题翻译：制造电熔刚玉的方法
公开(公告)号：US4177235A
公开(公告)日：1979-12-04
申请号：US860525
申请日：1977-12-14
申请人： Manfred Neidhardt , Gerhard Rehfeld
发明人： Manfred Neidhardt , Gerhard Rehfeld
IPC分类号： C01F7/02 , C01F7/46 , C04B35/107 , C09K3/14 , C04B35/10
CPC分类号： C09K3/1427 , C01F7/46 , C04B35/107 , C01P2002/02 , C01P2004/61 , C01P2006/36
摘要： A composition comprising .alpha.-alumina in a concentration of at least 99.95 weight percent and process for producing such .alpha.-alumina wherein alumina having an alkali metal content between 0.05 and 0.60 weight percent and Al.sub.2 O.sub.3 content of more than 95 weight percent is electrically fused with silica and additional alkali, if desired, in an electric arc furnace, the heated composition is cooled, comminuted and the so-formed glass phase is removed from an alumina containing phase by mechanical or chemical means.
摘要翻译：一种组合物，其包含浓度至少为99.95重量％的α-氧化铝和用于生产这种α-氧化铝的方法，其中碱金属含量为0.05-0.60重量％和Al 2 O 3含量大于95重量％的氧化铝与二氧化硅电融合和另外的碱，如果需要，在电弧炉中，将加热的组合物冷却，粉碎，并通过机械或化学方法从含氧化铝的相中除去如此形成的玻璃相。

3. 发明授权

US4049397A Process for the preparation of granulated abrasives from fused or sintered refractory inorganic hard substances having a high grain toughness 失效
$Process for the preparation of granulated abrasives from fused or sintered refractory inorganic hard substances having a high grain toughness$
标题翻译：从具有高晶粒韧性的熔融或烧结耐火无机硬物质制备造粒磨料的方法
公开(公告)号：US4049397A
公开(公告)日：1977-09-20
申请号：US568642
申请日：1975-04-16
申请人： Gerd-Edzard Bockstiegel , Manfred Neidhardt , Gerhard Rehfeld , Werner Umlauf
发明人： Gerd-Edzard Bockstiegel , Manfred Neidhardt , Gerhard Rehfeld , Werner Umlauf
IPC分类号： B02C17/00 , B24D3/00 , C09K3/14
CPC分类号： C09K3/1409
摘要： A process for the manufacture of granular abrasives having improved grain toughness from refractory, inorganic hard substances which comprises crushing a lump or block of said refractory inorganic substance, thereafter subjecting the resultant grains to a grind sorting process such that substantially only the porous grains, grains containing flaws or coarsely crystalline grains are comminuted and separating them in the ground condition from the balance of the material.
摘要翻译：一种用于制造具有从耐火材料，无机硬质物质提高晶粒韧性的颗粒磨料的方法，其包括粉碎所述耐火无机物质的块状物或块状物，然后对所得颗粒进行研磨分选过程，使得仅基本上仅将多孔颗粒，颗粒将含有瑕疵或粗晶粒粉碎并在地面条件下将其与材料的余量分离。

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