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Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781721567713 Category : Languages : en Pages : 36
Book Description
PS304 is a plasma spray deposited solid lubricant coating with feedstock composed of NiCr, Cr2O3, Ag, and BaF2-CaF2 powders. The effects of rounded BaF2-CaF2 particles on the gravity-fed flow characteristics of PS304 feedstock have been investigated. The BaF2-CaF2 powder was fabricated by water atomization using four sets of process parameters. Each of these powders was then characterized by microscopy and classified by screening to obtain 45 to 106 micron particles and added incrementally from 0 to 10 wt% to the other constituents of the PS304 feedstock, namely nichrome, chromia, and silver powders. The relationship between feedstock flow rate, measured with the Hall flowmeter, and concentration of fluorides was found to be linear in each case. The slopes of the lines were between those of the linear relationships previously reported using angular and spherical fluorides and were closer to the relationship predicted using the rule of mixtures. The results offer a fluoride fabrication technique potentially more cost-effective than gas atomization processes or traditional comminution processes. Stanford, Malcolm K. and DellaCorte, Christopher Glenn Research Center NASA/TM-2003-212125-REV-1, NAS 1.15:212125, E-13777-1
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781721567713 Category : Languages : en Pages : 36
Book Description
PS304 is a plasma spray deposited solid lubricant coating with feedstock composed of NiCr, Cr2O3, Ag, and BaF2-CaF2 powders. The effects of rounded BaF2-CaF2 particles on the gravity-fed flow characteristics of PS304 feedstock have been investigated. The BaF2-CaF2 powder was fabricated by water atomization using four sets of process parameters. Each of these powders was then characterized by microscopy and classified by screening to obtain 45 to 106 micron particles and added incrementally from 0 to 10 wt% to the other constituents of the PS304 feedstock, namely nichrome, chromia, and silver powders. The relationship between feedstock flow rate, measured with the Hall flowmeter, and concentration of fluorides was found to be linear in each case. The slopes of the lines were between those of the linear relationships previously reported using angular and spherical fluorides and were closer to the relationship predicted using the rule of mixtures. The results offer a fluoride fabrication technique potentially more cost-effective than gas atomization processes or traditional comminution processes. Stanford, Malcolm K. and DellaCorte, Christopher Glenn Research Center NASA/TM-2003-212125-REV-1, NAS 1.15:212125, E-13777-1
Author: C. DellaCorte Publisher: ISBN: Category : Nickel alloys Languages : en Pages : 22
Book Description
The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 deg C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS 304, is applied to the shaft by plasma spraying. PS304 is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS 304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
Author: Kazuhisa Miyoshi Publisher: CRC Press ISBN: 9781420027068 Category : Technology & Engineering Languages : en Pages : 420
Book Description
Solid Lubrication Fundamentals and Applications description of the adhesion, friction, abrasion, and wear behavior of solid film lubricants and related tribological materials, including diamond and diamond-like solid films. The book details the properties of solid surfaces, clean surfaces, and contaminated surfaces as well as discussing the structu
Author: A. H-J. Siegmund Publisher: Wiley-TMS ISBN: 9780470943151 Category : Technology & Engineering Languages : en Pages : 0
Book Description
This scope of the book extends from process fundamentals to operational practices, and also includes the important aspect of environmental issues. At the operations level, comprehensive reviews of the major applications of both metals are outlined. Emphasis is placed on recent commercial developments with less energy intensive technologies which are in harmony with environmental conservation. At the research level, the emphasis is placed on the better understanding of existing technologies and the development of new processing concepts. Environmental concerns, associated with the processing of both metals, are considered along with acceptable treatment and handling of by-products, wastes and bleed streams by the industry. Fundamental research and basic studies related to new Pb and Zn processes and to the understanding and basic theories of Pb and Zn processing are covered. Global factors affecting the production of zinc and lead including the economic aspects of the industries, product development and marketing endeavors, and environmental and health issues. Surveys of existing smelters and refineries for lead and zinc production are included. Zinc production technology, lead production technology, applications such as the galvanization of steel, chemicals, ZnO and batteries are covered. Environmental issues, recycling technologies, and product life cycle concerns are addressed.
Author: Lifeng Zhang Publisher: Springer ISBN: 3319481975 Category : Technology & Engineering Languages : en Pages : 315
Book Description
This collection provides researchers and industry professionals with complete guidance on the synthesis, analysis, design, monitoring, and control of metals, materials, and metallurgical processes and phenomena. Along with the fundamentals, it covers modeling of diverse phenomena in processes involving iron, steel, non-ferrous metals, and composites. It also goes on to examine second phase particles in metals, novel sensors for hostile-environment materials processes, online sampling and analysis techniques, and models for real-time process control and quality monitoring systems.
Author: J.H. Simons Publisher: Elsevier ISBN: 0323142451 Category : Science Languages : en Pages : 815
Book Description
Fluorine Chemistry, Volume IV provides an extensive survey and discussion on the physiological properties of fluoride ion and substances capable of producing it in aqueous solution. This book elaborates the detrimental effects of excessive fluoride ingestion, through the beneficial effects of optimal amounts, to recognized detrimental effects, such as dental caries accompanied by suboptimal fluoride intake. Fluoride metabolism is discussed in detail, including the capacity for storage of fluoride by the bones and rates of excretion of fluoride from the body. This text also covers the relation of fluoride ion to the health of teeth and bones. This publication is a good source for chemists and clinicians intending to acquire knowledge of the biological effects of fluoride.
Author: National Aeronautics and Space Administration (NASA)
Author: National Aeronautics and Space Administration (NASA)
Author: 
Author: C. DellaCorte
Author: Kazuhisa Miyoshi
Author: M.A. Imam
Author: A. H-J. Siegmund
Author: Lifeng Zhang
Author: Jian-Feng Nie
Author: Thomas G. Reeves
Author: J.H. Simons