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公开(公告)号：US4156147A
公开(公告)日：1979-05-22
申请号：US866101
申请日：1977-12-30
申请人： Robert G. Naum , Dean P. Owens , George I. Dooher
发明人： Robert G. Naum , Dean P. Owens , George I. Dooher
摘要： A neutron absorbing article, preferably in flat plate form and suitable for use in a storage rack for spent nuclear fuel, includes boron carbide particles, diluent particles and a solid, irreversibly cured phenolic polymer cured to a continuous matrix binding the boron carbide and diluent particles. The total content of boron carbide and diluent particles is a major proportion of the article and the content of cured phenolic polymer present is a minor proportion. By regulation of the ratio of boron carbide particles to diluent particles, normally within the range of 1:9 and 9:1 and preferably within the range of 1:5 to 5:1, the neutron absorbing activity of the product may be controlled, which facilitates the manufacture of articles of particular absorbing activities best suitable for specific applications.
摘要翻译： {PG，1 A中子吸收制品，优选为平板形式并适用于废核燃料的储存架，包括碳化硼颗粒，稀释剂颗粒和固化的不可逆固化的酚醛聚合物，固化至连接基体上的硼 碳化物和稀释剂颗粒。 碳化硼和稀释剂颗粒的总含量是制品的主要比例，而固化酚醛聚合物的含量是一小部分。 通过调节碳化硼颗粒与稀释剂颗粒的比率，通常在1:9和9:1的范围内，优选在1:5至5:1的范围内，可以控制产物的中子吸收活性， 这有助于制造最适合于特定应用的特定吸收活性物品。
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公开(公告)号：US4225467A
公开(公告)日：1980-09-30
申请号：US854966
申请日：1977-11-25
摘要： A neutron absorbing article, preferably in long, thin, flat form, suitable for but not necessarily limited to use in storage racks for spent nuclear fuel at locations between volumes of such stored fuel, to absorb neutrons from said spent fuel and prevent uncontrolled nuclear reaction of the spent fuel material, is composed of finely divided boron carbide particles and a solid, irreversibly cured phenolic polymer, forming a continuous matrix about the boron carbide particles, in such proportions that at least 6% of B.sup.10 from the boron carbide content is present therein. The described articles withstand thermal cycling from repeated spent fuel insertions and removals, withstand radiation from said spent nuclear fuel over long periods of time without losing desirable neutron absorbing and physical properties, are sufficiently chemically inert to water so as to retain neutron absorbing properties if brought into contact with it, are not galvanically corrodible and are sufficiently flexible so as to withstand operational basis earthquake and safe shutdown earthquake seismic events, without loss of neutron absorbing capability and other desirable properties, when installed in storage racks for spent nuclear fuel. The disclosure also relates to a plurality of such neutron absorbing articles in a storage rack for spent nuclear fuel and to a method for the manufacture of the articles.
摘要翻译： 一种中子吸收制品，优选为长而薄的平坦形式，适用于但不一定限于在这种储存燃料的体积之间的位置处用于废核燃料的储存架中，以从所述乏燃料中吸收中子并防止不受控制的核反应 的乏燃料材料由细碎的碳化硼颗粒和固体的不可逆固化的酚醛聚合物组成，其形成了围绕碳化硼颗粒的连续的基体，其比例使得来自碳化硼含量的B10至少为6％ 其中。 所描述的物品耐受重复的乏燃料插入和去除的热循环，在长时间内耐受来自所述废核燃料的辐射，而不失去理想的中子吸收和物理性质，对水充分地具有化学惰性，从而保持中子吸收性能，如果带来 与电极接触时，不会电流腐蚀，并且具有足够的柔性，以便在安装在废核燃料的储存架上时，能够承受操作基础地震和安全停堆地震事件，而不损失中子吸收能力和其他所需性能。 本公开还涉及用于乏核燃料的储存架中的多个这样的中子吸收制品和用于制造制品的方法。
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公开(公告)号：US4287145A
公开(公告)日：1981-09-01
申请号：US133182
申请日：1980-03-24
摘要： A neutron absorbing article, preferably in long, thin, flat form, suitable for but not necessarily limited to use in storage racks for spent nuclear fuel at locations between volumes of such stored fuel to absorb neutrons from said spent fuel and prevent uncontrolled nuclear reaction of the spent fuel material, is composed of finely divided boron carbide particles and a solid, irreversibly cured phenolic polymer forming a continuous matrix about the boron carbide particles, in such proportions that at least 6% of B.sup.10 from the boron carbide content is present therein. The described structures possess a multiplicity of desirable properties for the use mentioned, including withstanding thermal cycling from repeated spent fuel insertions and removals, withstanding radiation from said spent nuclear fuel over long periods of time without losing desirable neutron absorbing and physical properties, being sufficiently chemically inert to water so as to retain neutron absorbing properties if brought into contact with it, not being galvanically corroding and being sufficiently flexible so as to withstand operational basis earthquake and safe shutdown earthquake seismic events without loss of neutron absorbing capability and other desirable properties when installed in storage racks for spent nuclear fuel. In preferred embodiments of the invention the phenolic polymer is a phenol formaldehyde type polymer, such as a trimethylol phenol formaldehyde type polymer, the boron carbide contains at least 12% of B.sup.10, the plate contains from 8.0 to 11.5% thereof, the plate density is 1.6 to 2.1 g./cc. and the proportions of boron carbide (which may be accompanied by limited amounts of certain impurities) and phenol formaldehyde type polymer (preferably free of halogens, mercury, lead and sulfur) are from 20 to 35% of the former and 65 to 80% of the latter. The invention also relates to a plurality of such neutron absorbing articles in a storage rack for spent nuclear fuel and to a method for the manufacture of the articles. In the manufacturing method a portion of the phenol formaldehyde type resin, in liquid state, is mixed with the boron carbide particles, compacted and cured, after which the cured article is impregnated with additional phenol formaldehyde type resin, which is then cured to make the final product.
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公开(公告)号：US4213883A
公开(公告)日：1980-07-22
申请号：US866102
申请日：1977-12-30
申请人： Dean P. Owens
发明人： Dean P. Owens
摘要： Neutron absorbing articles, such as those in plate form suitable for use in a storage rack for spent nuclear fuel and having such properties as to make them useful in such application for long periods of time, are made by an improved one-step curing method in which a mixture of boron carbide particles, powdered phenolic resin and a minor proportion of a liquid medium which boils at a temperature below 200.degree. C., preferably water, is compacted to desired article form and is cured at an elevated temperature, without simultaneous imposition of pressure in compacting or pressing means, so as to cause bonding of the irreversibly cured phenolic polymer resulting to the boron carbide particles and production of the neutron absorber in desired form. In preferred aspects of the invention the proportions of boron carbide particles, resin and water are respectively, 60 to 80, 20 to 40 and 2 to 8, the resin is a phenol formaldehyde two-stage resin containing hexamethylenetetramine in sufficient quantity to provide formaldehyde to cure it, the resin is of a molecular weight in the range of 1,200 to 10,000, e.g., 6,500, the resin and the irreversibly cured polymer resulting are substantially free of halogens, lead, mercury, sulfur, filler, plasticizer and solvent and the boron carbide particles contain no more than 2% of iron and no more than 0.5% of B.sub.2 O.sub.3. The described method is also employable when a proportion of the boron carbide particles, e.g., 1/10 to 9/10, is replaced by a diluent compound, such as silicon carbide, alumina, silica, graphite, amorphous carbon or mixtures thereof.
摘要翻译： 通过改进的一步固化方法制备中子吸收制品，例如适合用于废核燃料的储存架的板形式的吸收制品，并具有使其在这种应用中长时间有用的性质 其中碳化硼颗粒，粉末状酚醛树脂和少量液体介质的混合物在低于200℃，优选水中沸腾的液体介质的混合物被压实成所需的制品形式并且在升高的温度下固化，而不同时施加 的压制或压制装置中的压力，从而导致由碳化硼颗粒引起的不可逆固化的酚醛聚合物和所需形式的中子吸收体的生成。 在本发明的优选方面，碳化硼颗粒，树脂和水的比例分别为60至80,20至40和2至8，树脂是含有足够数量的六亚甲基四胺的酚醛二级树脂，以提供甲醛 其树脂的分子量范围为1200至10,000，例如6,500，树脂和不可逆固化的聚合物基本上不含卤素，铅，汞，硫，填料，增塑剂和溶剂，硼 碳化物颗粒含有不超过2％的铁和不超过0.5％的B2O3。 当一部分碳化硼颗粒例如1/10至9/10被诸如碳化硅，氧化铝，二氧化硅，石墨，无定形碳或其混合物的稀释化合物代替时，所述方法也可用。
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公开(公告)号：US5441799A
公开(公告)日：1995-08-15
申请号：US177642
申请日：1994-01-04
申请人： Dean P. Owens , Irving B. Ruppel
发明人： Dean P. Owens , Irving B. Ruppel
CPC分类号： C04B38/00 , F16C33/043 , F16C33/30 , F16J15/3496 , Y10T428/24942 , Y10T428/249967 , Y10T428/249969
摘要： Silicon carbide sintered bodies having controlled porosity in the range of about 3-25 vol % are prepared from raw batches containing a multimodal distribution of silicon carbide particles and comprised of at least a first set of particles having one average grain size and a second set of particles having another average grain size larger than the first set of particles. The resulting pores are 3-5 microns in the largest dimension, with an aspect ratio between about 1/1 and about 3/1 . The porous bodies, e.g., in the form of mechanical seal members, exhibit good tribological properties.
摘要翻译： 具有约3-25体积％范围内控制孔隙率的碳化硅烧结体由含有碳化硅颗粒的多峰分布的生批料制备，并由至少第一组具有一个平均粒度的颗粒组成，第二组由 具有比第一组颗粒更大的平均晶粒尺寸的颗粒。 所得孔在最大尺寸为3-5微米，纵横比约为1/1至约3/1。 多孔体，例如以机械密封构件的形式表现出良好的摩擦学特性。
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