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  • NONMETALLIC MATERIALS  (6)
  • 1
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    Mechanical strength and tribological behavior of ion-beam-deposited boron nitride films on non-metallic substrates (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An investigation was conducted to examine the mechanical strength and tribological properties of boron nitride (BN) films ion-beam deposited on silicon (Si), fused silica (SiO2), gallium arsenide (GaAs), and indium phosphide (InP) substrates in sliding contact with a diamond pin under a load. The results of the investigation indicate that BN films on nonmetallic substrates, like metal films on metallic substrates, deform elastically and plastically in the interfacial region when in contact with a diamond pin. However, unlike metal films and substrates, BN films on nonmetallic substrates can fracture when they are critically loaded. Not only does the yield pressure (hardness) of Si and SiO2 substrates increase by a factor of 2 in the presence of a BN film, but the critical load needed to fracture increases as well. The presence of films on the brittle substrates can arrest crack formation. The BN film reduces adhesion and friction in the sliding contact. BN adheres to Si and SiO2 and forms a good quality film, while it adheres poorly to GaAs and InP. The interfacial adhesive strengths were 1 GPa for a BN film on Si and appreciably higher than 1 GPa for a BN film on SiO2.
    Keywords: NONMETALLIC MATERIALS
    Type: Surface and Coatings Technology (ISSN 0257-8972); 33; 221-233
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Boron nitride - Composition, optical properties, and mechanical behavior (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A low energy ion beam deposition technique was used to grow boron nitride films on quartz, germanium, silicon, gallium arsenide, and indium phosphate. The film structure was amorphous with evidence of a hexagonal phase. The peak boron concentration was 82 at. percent. The carbon and oxygen impurities were in the 5 to 8 at. percent range. Boron-nitrogen and boron-boron bonds were revealed by X-ray photoelectron spectroscopy. The index of refraction varied from 1.65 to 1.67 for films deposited on III-V compound semiconductors. The coefficient of friction for boron nitride in sliding contact with diamond was less than 0.1. The substrate was silicon.
    Keywords: NONMETALLIC MATERIALS
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  • 3
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    Mechanical strength and tribological behavior of ion-beam deposited boron nitride films on non-metallic substrates (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An investigation was conducted to examine the mechanical strength and tribological properties of boron nitride (BN) films ion-beam deposited on silicon (Si), fused silica (SiO2), gallium arsenide (GaAs), and indium phosphide (InP) substrates in sliding contact with a diamond pin under a load. The results of the investigation indicate that BN films on nonmetallic substrates, like metal films on metallic substrates, deform elastically and plastically in the interfacial region when in contact with a diamond pin. However, unlike metal films and substrates, BN films on nonmetallic substrates can fracture when they are critically loaded. Not only does the yield pressure (hardness) of Si and SiO2 substrates increase by a factor of 2 in the presence of a BN film, but the critical load needed to fracture increases as well. The presence of films on the brittle substrates can arrest crack formation. The BN film reduces adhesion and friction in the sliding contact. BN adheres to Si and SiO2 and forms a good quality film, while it adheres poorly to GaAs and InP. The interfacial adhesive strengths were 1 GPa for a BN film on Si and appreciably higher than 1 GPa for a BN film on SiO2.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-89818 , E-3439 , NAS 1.15:89818
    Format: application/pdf
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  • 4
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    Adhesion, friction, and deformation of ion-beam-deposited boron nitride films (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The tribological properties and mechanical strength of boron nitride films were investigated. The BN films were predominantly amorphous and nonstoichiometric and contained small amounts of oxides and carbides. It was found that the yield pressure at full plasticity, the critical load to fracture, and the shear strength of interfacial adhesive bonds (considered as adhesion) depended on the type of metallic substrate on which the BN was deposited. The harder the substrate, the greater the critical load and the adhesion. The yield pressures of the BN film were 12 GPa for the 440C stainless steel substrate, 4.1 GPa for the 304 stainless steel substrate, and 3.3 GPa for the titanium substrate.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-88902 , E-3326 , NAS 1.15:88902
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  • 5
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    Plasma-deposited amorphous hydrogenated carbon films and their tribological properties (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Recent work on the properties of diamondlike carbon films and their dependence on preparation conditions are reviewed. The results of the study indicate that plasma deposition enables one to deposit a variety of amorphous hydrogenated carbon (a-C:H ) films exhibiting more diamondlike behavior to more graphitic behavior. The plasma-deposited a-C:H can be effectively used as hard, wear-resistant, and protective lubricating films on ceramic materials such as Si(sub 3)N(sub 4) under a variety of environmental conditions such as moist air, dry nitrogrn, and vacuum.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-102379 , E-5118 , NAS 1.15:102379
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  • 6
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    Diamondlike carbon as a moisture barrier and antireflecting coating on optical materials (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Diamondlike carbon (DLC) is amorphous, hard, semitransparent, and is under consideration for use as a coating material for infrared optics. DLC is also designated as a-C:H to indicate its amorphous nature as well as to indicate the presence of large (20 to 55 percent) amounts of hydrogen in the film. Two important questions arise with respect to use of DLC in infrared optics. Will the lack of grain boundaries help to keep moisture from penetrating the film. Secondly, application as an antireflection coating places restrictions on the allowed values of the index of refraction of the film relative to the particular substrate material being used. Will DLC have the correct index range. These two questions are addressed in this paper.
    Keywords: NONMETALLIC MATERIALS
    Type: Solid State Technology Branch of NASA Lewis Research Center Second Annual Digest, June 1989 - June 1990; p 232-237
    Format: application/pdf
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