ISSN:0947-076X    

DOI:10.1002/vipr.19900020202

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19900020203

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19900020204

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19900020205

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

摘要:

AbstractPowder‐Technology has developed into a significant and still increasing market. There is a demand for high quality meaning highest purity and spherical particle shape of the powder. In order to reach this aim metal alloys are melted under vacuum and atomized with intertgas. To improve the chemical purity the produced powder is treated under vacuum for instance by the static or dynamic degassing proces

ISSN:0947-076X    

DOI:10.1002/vipr.19900020206

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

摘要:

AbstractThe development of high vacuum pumps and systems during the last 35 years can be characterized by a trend of gradual elimination of liquids exposed to vacuum environment. The need for high purity vacuum process equipment precipitated the development of new pumping techniques: iongettering pumps, turbomolecular pumps and cryopumps. During the last 5 years, a number of dry coarse‐vacuum pumps have been developed. Some are entirely oilfree, some still use lubricants at the seals separating the driving mechanism from the vacuum side. This review contains general design and performance characteristics of four classes of equipment: hermetically sealed pumps using bellows to isolate the driving mechanism, a variety of multistaged positive displacement blowers, pumping trains based on turbo‐drag pumps, and multistaged reciprocal piston pumps. It is entirely practical to achieve pressure of 105to 106while discharging to atmosphere. Despite a complete absence of conventional lubrication in some of these pumps, periods exceeding 10000 hours without maintenance are obtained, providing a viable technology for clean vacuum syst

ISSN:0947-076X    

DOI:10.1002/vipr.19900020207

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

摘要:

AbstractIn Part 1 (Henning, Materials used in Vacuum Technology), the application possibilities of different materials in vacuum technology were described. Part 2 describes the most important non‐detachable connections of these materials to produce components that can be used in vacuum technology.The following processes are suitable for this purpose:○Welding○Soldering○Glueing○FusionFor this reason, these four processes will be discussed in detail here; their advantages and disadvantages described and their worthiness for use in vacuum technology indicated.It should be noted here that other nondetachable connections such as rivets, point welding, projection seam welding or roll seam welding do not meet the demands of gas tightness made in vacuum technology and cannot, therefore, be used for such

ISSN:0947-076X    

DOI:10.1002/vipr.19900020208

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

摘要:

AbstractThe growing demands for better quality of metallic materials can only be met by the application of vacuum during the production of these metals and alloys and their field of application.

ISSN:0947-076X    

DOI:10.1002/vipr.19900020209

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19900020210

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19900020211

出版商:WILEY‐VCH Verlag    

年代:1990

数据来源: WILEY