Alumina grit blasting parameters for surface preparation in the plasma spraying operation

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[唯一标识符]:CDSITC.AEROSPACE.A97-32697
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1997-32697; Reference AN: A97-32697
[标题]:Alumina grit blasting parameters for surface preparation in the plasma spraying operation
[作者]:Mellali M; Fauchais P; Grimaud A; Leger A C; Lu J
[来源]:Journal-of-Thermal-Spray-Technology. 1997 June; vol. 6, no. 2: 217-227
[文摘]:This paper examines how the grit blasting process influences the surface roughness of different substrates, the grit residue, and the grit erosion. The influence of grit blasting conditions on induced substrate residual stresses is also discussed. Aluminum alloy, cast iron, and hard steel were blasted with white alumina grits of 0.5-, 1-, and 1.4-mm mean diameters. Grit blasting was performed using either a suction-type or a pressure-type machine equipped with straight nozzles made of B4C. The influence of the following parameters was studied: grit blasting distance (56 to 200 mm), blasting time (3 to 30 s), angle between nozzle and blasted surface (30, 60, 90 deg), and blasting pressure (0.2 to 0.7 MPa). The grit residue remaining at the blasted surface was evaluated after cleaning by image analysis. Grit size was determined to be the most important influence on roughness. The average values of Ra and Rt and the percentage of grit residue increased with grit size as well as the depth of the plastic zone under the substrate. (Author)
[关键词]:ALUMINUM OXIDES; GRIT ; PLASMA SPRAYING; BLASTS ; SURFACE TREATMENT; SURFACE ROUGHNESS; RESIDUAL STRESS; ALUMINUM ALLOYS; SUCTION ; STRESS MEASUREMENT; CONTAMINATION ; WEAR ; SIZE DISTRIBUTION; SUBSTRATES
[出版年份]:1997
[专业领域]:MECHANICAL ENGINEERING
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[唯一标识符]:CDSITC.AEROSPACE.A89-54222
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1989-54222; Reference AN: A89-54222
[标题]:Combined effects of radiation and trauma
[作者]:MESSERSCHMIDT OTFRIED
[来源]:(COSPAR Plenary Meeting 27th Topical Meetings and Workshop XIX on Life Sciences and Space Research XXIII(4) Radiation Biology Espoo Finland July 18 29 1988) Advances in Space Research. vol. 9, no. 10, 1989, p. 197 201.
[文摘]:Wounds or burns which, in general, do not cause septicaemia could become entrance ports for bacteria when animals are exposed to whole-body irradiation. Thrombocytopenia is the reason for hemorrhages in wounds. The susceptibility to shock is increased considerably in combined injuries and the formation of callus in the bone fractures is significantly delayed. The healing of wounds and burns in the initial phase of the radiation syndrome does not always differ from healing in the nonirradiated organism. However, a few days or weeks later very serious wound infections and hemorrhages can occur. The additional injuries almost always worsen the development and prognosis of radiation-induced disease. The recommended treatment for combined injuries will differ in many respects from the treatment of wounds and burns or the radiation syndrome. (Author)
[关键词]:BURNS INJURIES; RADIATION EFFECTS; RADIATION INJURIES; RADIOBIOLOGY ; WOUND HEALING; CLINICAL MEDICINE; PATHOLOGY ; RADIATION HAZARDS; SIGNS AND SYMPTOMS
[出版年份]:1989
[专业领域]:LIFE SCIENCES GENERAL
[唯一标识符]:CDSTIC.ISTP.339719
[文献来源]:科学技术会议录索引(ISTP)
[文献类型]:科技会议
[标题]:THE IMPACT OF LEO CONSTELLATION DEPLOYMENT ON THE EVOLUTION OF THE SPACE DEBRIS POPULATION
[作者]:P WEGENER;J BENDISCH;H ENGLING;R STOLZ
[出版单位]:UNIVELT INCSAN DIEGO
[ISSN_ISBN]:0-87703-474-5
[会议名称]:32nd Symposium of the International-Academy-of-Astronautics on Safety, Rescue, and Quality in conjunction with the 50th International-Astronautical-Federation Congress,AMSTERDAM, NETHERLANDS,October 4-8, 1999
[来源]:SPACE DEBRIS 1999,pp 229-239
[系列名称]:SCIENCE AND TECHNOLOGY SERIES
[编辑者]:EJ Bendisch
[主办单位]:Amer Astronaut Soc;Int Acad Astronaut;Int Astronaut Federat
[地址]:P WEGENER,TECH_UNIV_CAROLO_WILHELMINA_BRAUNSCHWEIG, IFR, INST FLIGHT MECHAN & SPACEFLIGHT TECHNOL, D-3300 BRAUNSCHWEIG, GERMANY
[专业领域]:ASTRONOMY & ASTROPHYSICS,ENGINEERING, AEROSPACE