摘要:
The invention provides a particulate composition adapted for forming a bone graft substitute cement upon mixing with an aqueous solution, comprising i) a calcium sulfate hemihydrate powder, wherein the calcium sulfate hemihydrate is present at a concentration of at least about 50 weight percent based on the total weight of the particulate composition; ii) a monocalcium phosphate monohydrate powder; iii) a non-porous ²-tricalcium phosphate powder; and iv) a porous ²-tricalcium phosphate powder. Bone graft substitute cements made therefrom, a bone graft substitute kit comprising the particulate composition, methods of making and using the particulate composition, and articles made from the bone graft substitute cement are also provided.
摘要:
The present invention provides for a refractory aggregate composition comprising an improved calcium aluminate clinker having the formula CnAx wherein C is calcium oxide and A is aluminum oxide, wherein n is an integer from about 1 to about 12, wherein x is an integer from about 1 to about 24, and wherein said clinker has from zero to less than about fifty weight percent C12A7. Analogs, derivatives and hydrates of the improved calcium aluminate clinker are provided. A refractory composition and a sprayable refractory composition are disclosed comprising the improved calcium aluminate clinker. A method for improving the insulating character and/or penetration resistance of a liner in contact with molten aluminum in an aluminum manufacturing process or during aluminum transport is provided.
摘要:
The invention relates to a method for manufacturing a composition of lightweight concrete or mortar having a dry density of 200 to 1400 kg/m3 into which are mixed components comprising at least light aggregates with a particle density of 50 to 1000 kg/m3, at least one mineral binder selected among the hydraulic binders, the sources of calcium sulphates and lime, at least one foaming agent and water, and optionally one or more additives, said foaming agent being a polyvinyl alcohol and the foaming thereof occurring in place during the mixing thereof with water and at least one of the components selected from among the aggregates and/or the mineral binder.
摘要翻译:本发明涉及一种制造干密度为200〜1400kg / m 3的轻质混凝土或砂浆组合物的方法,其中至少包含至少包含粒径密度为50-1000kg / m 3的轻聚集体的混合组分,至少 选自水硬性粘合剂,硫酸钙和石灰源,至少一种发泡剂和水以及任选的一种或多种添加剂的一种矿物粘合剂,所述发泡剂是聚乙烯醇,并且其发泡在混合期间发生在适当位置 与水和选自聚集体和/或矿物粘合剂中的至少一种组分。
摘要:
Methods and cement compositions are provided that utilize treated polyolefin fibers for lost circulation and/or mechanical property enhancement. Disclosed is a method comprising: providing a cement composition comprising: a hydraulic cement; water; and treated polyolefin fibers that are rod-shaped and have a length in a range from about 0.0625 inches to about 0.25 inches, wherein the treated polyolefin fibers have been treated with a surfactant to make the treated polyolefin fibers hydrophilic; placing the cement composition in a selected location; and allowing the cement composition to set.
摘要:
The invention provides a particulate composition adapted for forming a bone graft substitute cement upon mixing with an aqueous solution, comprising i) a calcium sulfate hemihydrate powder, wherein the calcium sulfate hemihydrate is present at a concentration of at least about 50 weight percent based on the total weight of the particulate composition; ii) a monocalcium phosphate monohydrate powder; iii) a non-porous ²-tricalcium phosphate powder; and iv) a porous ²-tricalcium phosphate powder. Bone graft substitute cements made therefrom, a bone graft substitute kit comprising the particulate composition, methods of making and using the particulate composition, and articles made from the bone graft substitute cement are also provided.
摘要:
A transition fluid comprises: a hydrocarbon liquid, wherein the hydrocarbon liquid is the external phase of the transition fluid; an aqueous liquid, wherein the aqueous liquid is the internal phase of the transition fluid and wherein the aqueous liquid comprises a water-soluble salt; and a calcium aluminate cement. A method of cementing in a subterranean formation comprises: introducing the transition fluid into the subterranean formation; and introducing a cement composition into the subterranean formation, wherein the step of introducing the cement composition is performed after the step of introducing the transition fluid and wherein the cement composition comprises cement and water.
摘要:
Methods and cement compositions are provided that utilize treated polyolefin fibers for lost circulation and/or mechanical property enhancement. Disclosed is a method comprising: providing a cement composition comprising: a hydraulic cement; water; and treated polyolefin fibers that are rod-shaped and have a length in a range from about 0.0625 inches to about 0.25 inches, wherein the treated polyolefin fibers have been treated with a surfactant to make the treated polyolefin fibers hydrophilic; placing the cement composition in a selected location; and allowing the cement composition to set.
摘要:
The present invention relates to a current composition for cementing oil or gas wells. The composition comprises calcium aluminate cement in which the proportion of HC203 is at least 50% by weight, dispersant, microsilica, mineral particles, water and optionally a retarder.
摘要翻译:本发明涉及用于固井油气井的当前组合物。 该组合物包括其中HC 2 O 3的比例为至少50重量%,分散剂,微硅石,矿物颗粒,水和任选的缓凝剂的铝酸钙水泥。