公开(公告)号：US5063021A

公开(公告)日：1991-11-05

申请号：US527456

申请日：1990-05-23

申请人： Vidhu Anand ,  Sanjay Sampath ,  Clarke D. Davis ,  David L. Houck

发明人： Vidhu Anand ,  Sanjay Sampath ,  Clarke D. Davis ,  David L. Houck

IPC分类号： C23C4/02 ,  C23C4/06

CPC分类号： C23C4/067

摘要： A method is disclosed for preparing an intimate mixture of powders of nickel-boron-silicon alloy and molybdenum metal powder suitable for thermal spray coatings which comprises milling a starting mixture of the alloy and molybdenum powder to produce a milled mixture wherein the average particle size is less than about 10 micrometers in diameter, forming an aqueous slurry of the resulting milled mixture and a binder which can be an ammoniacal molybdate compound or polyvinyl alcohol, and agglomerating the milled mixture and binder. The intimate mixture and binder are preferably sintered in a reducing atmosphere at a temperature of about 800.degree. C. to about 950.degree. C. for a sufficient time to form a sintered partially alloyed mixture wherein the bulk density is greater than about 1.2 g/cc. The resulting sintered mixture is preferably entrained in an inert carrier gas, passed into a plasma flame wherein the plasma gas can be argon or a mixture of argon and hydrogen, and maintained in the plasma flame for a sufficient time to melt essentially all of the powder particles of the sintered mixture to form spherical particles of the melted portion, and to further alloy the sintered mixture, and cooled.

公开(公告)号：US5126104A

公开(公告)日：1992-06-30

申请号：US710851

申请日：1991-06-06

申请人： Vidhu Anand ,  Sanjay Sampath ,  David L. Houck ,  Jack E. Vanderpool

发明人： Vidhu Anand ,  Sanjay Sampath ,  David L. Houck ,  Jack E. Vanderpool

IPC分类号： B22F1/00 ,  C22C32/00 ,  C23C4/06

CPC分类号： C22C32/0047 ,  B22F1/0096 ,  C23C4/06 ,  B22F2999/00

摘要： A method is disclosed for preparing an intimate mixture of powders of nickel-chromium-boron-silicon alloy, molybdenum metal powder, and Cr.sub.3 C.sub.2 /NiCr alloy suitable for thermal spray coatings which comprises milling a starting mixture of the above two alloys with molybdenum powder to produce a milled mixture wherein the average particle size is less than about 10 micrometers in diameter, forming an aqueous slurry of the resulting milled mixture and a binder which can be an ammoniacal molybdate compound or polyvinyl alcohol, and agglomerating the milled mixture and binder. The intimate mixture and binder may be sintered in a reducing atmosphere at a temperature of about 800.degree. C. to 950.degree. C. for a sufficient time to form a sintered partially alloyed mixture wherein the bulk density is greater than about 1.2 g/cc. The resulting sintered mixture may be entrained in an inert carrier gas, passed into a plasma flame wherein the plasma gas can be argon or a mixture of argon and hydrogen, and maintained in the plasma flame for a sufficient time to melt essentially all of the powder particles of the sintered mixture to form spherical particles of the melted portion, and to further alloy the sintered mixture, and cooled.

摘要翻译： 公开了一种制备适用于热喷涂的镍 - 铬 - 硼 - 硅合金，钼金属粉末和Cr3C2 / NiCr合金粉末的紧密混合物的方法，该方法包括将上述两种合金的起始混合物与钼粉末 产生直径小于约10微米的平均粒度的研磨混合物，形成所得研磨混合物的水性浆液和可以是氨基钼酸盐化合物或聚乙烯醇的粘合剂，并使研磨的混合物和粘合剂附聚。 紧密混合物和粘合剂可以在还原气氛中在约800℃至950℃的温度下烧结足够的时间以形成烧结的部分合金化混合物，其中堆积密度大于约1.2g / cc。 所得到的烧结混合物可以夹带在惰性载气中，通入等离子体火焰中，其中等离子体气体可以是氩气或氩气和氢气的混合物，并保持在等离子体火焰中足够的时间以熔化基本上所有的粉末 烧结混合物的颗粒形成熔融部分的球形颗粒，并进一步合并烧结的混合物并冷却。

公开(公告)号：US4561892A

公开(公告)日：1985-12-31

申请号：US617010

申请日：1984-06-05

申请人： Prabhat Kumar ,  Vidhu Anand

发明人： Prabhat Kumar ,  Vidhu Anand

IPC分类号： C22C19/00 ,  C23C4/06 ,  C23C4/12 ,  C22C19/03 ,  C22C19/07

CPC分类号： C23C4/06 ,  Y10T428/12063

摘要： Disclosed is a coated substrate article coated with an alloy powder containing, in weight percent, 7 to 19 silicon, up to 5 copper balance nickel, cobalt and/or iron plus impurities. The articles may be coated by a variety of spray coating processes; however, plasma spray coating is preferred. The coated article is especially suited for use in severe conditions of wet corrosion.

摘要翻译： 公开了涂覆有合金粉末的涂覆的基材制品，其中重量百分比为7至19个硅，至多5个铜平衡镍，钴和/或铁加杂质。 制品可以通过各种喷涂工艺涂覆; 然而，优选等离子喷涂。 涂层制品特别适用于恶劣条件下的湿润腐蚀。

公开(公告)号：US4976948A

公开(公告)日：1990-12-11

申请号：US416754

申请日：1989-09-29

申请人： Vidhu Anand ,  David L. Houck ,  Dennis C. Smouse

发明人： Vidhu Anand ,  David L. Houck ,  Dennis C. Smouse

IPC分类号： C01G37/02

CPC分类号： C01G37/02 ,  C01P2004/32 ,  C01P2006/10 ,  C01P2006/20 ,  C01P2006/80 ,  Y10S423/10

摘要： A process is disclosed for producing chromium oxide powders, which comprises forming an aqueous slurry wherein the solids content is a mixture which consists essentially of in percent by weight about 5 to 15 chromium acetate and the balance chromium oxide, agglomerating the mixture, sintering the resulting agglomerated mixture in a hydrogen atmosphere at a temperature at about 1400.degree. C. to about 1550.degree. C. in metallic vessels, entraining the sintered chromium oxide powder in a carrier gas, passing the sintered chromium oxide powder and the carrier gas through a plasma flame at a power of about 10 to about 80 KW using an inert gas as the plasma gas, and cooling the resulting plasma heated chromium oxide powder to produce free flowing chromium oxide powder having a free chromium content of less than about 1% by weight.

摘要翻译： 公开了一种用于生产氧化铬粉末的方法，其包括形成含水浆料，其中固体含量为基本上以重量百分比计约5至15％的乙酸铬和余量的氧化铬，混合该混合物，将所得 在氢气气氛中在约1400℃至约1550℃的温度下在金属容器中，将烧结的氧化铬粉末夹带在载气中，使烧结的氧化铬粉末和载气通过等离子体火焰 以约10至约80KW的功率使用惰性气体作为等离子体气体，并冷却所得到的等离子体加热的氧化铬粉末以产生游离铬含量小于约1重量％的自由流动的氧化铬粉末。

公开(公告)号：US4925626A

公开(公告)日：1990-05-15

申请号：US337678

申请日：1989-04-13

申请人： Vidhu Anand ,  David L. Houck

发明人： Vidhu Anand ,  David L. Houck

IPC分类号： C22C29/06 ,  C23C4/06 ,  C23C30/00

CPC分类号： C22C29/067 ,  C23C30/00 ,  C23C4/06

摘要： A method is disclosed for producing a Wc-Co-Cr alloy which comprises alloying a mixture consisting essentially of in percent by weight of from about 85 to about 90 tungsten carbide, wherein the particle size of the tungsten carbide is less than about 1 micrometer in diameter, from about 9 to about 11 cobalt metal powder, wherein the particle size of the cobalt is from about 1 to about 5 micrometers in diameter, and from about 3.5 to about 4.5 chromium wherein the chromium is provided as chromium carbide to produce a Wc-Co-Cr alloy the alloy capable of being used as a coating wherein the hardness of the coating is from about 1060 to about 1240 DPH carbide hardness and from about 870 to about 980 DPH matrix hardness and wherein the roughness is from about 190 to about 200 AA.

摘要翻译： 公开了一种用于生产Wc-Co-Cr合金的方法，其包括将基本上由重量百分比组成的约85至约90碳化钨合并，其中碳化钨的粒度小于约1微米 约9至约11个钴金属粉末，其中钴的颗粒直径为约1至约5微米，约3.5至约4.5铬，其中铬作为碳化铬提供以产生Wc -Co-Cr合金能够用作涂层的合金，其中涂层的硬度为约1060至约1240DPH碳化物硬度和约870至约980DPH基体硬度，并且其中粗糙度为约190至约 200 AA。