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Adhesive strength of the amorphous SiNxCy ceramic films by P-CVD method
Get PDFUsing a plasma CVD apparatus, SiNxCy films (Si3N4-SiC, SiNx, SiCy) are prepared from SiH4-90%Ar, NH3, C2H4 and H2 gases on a crown glass substrate. Adhesive strength is evaluated using critical peel load (Lc) and critical peel shear stress (σcs) as measured with the scratch test.
The effects of the compositional change from Si3N4 to SiC films are investigated. When the film thickness is 1 μm, the composition dependence is large, and Lc varies greatly from 19.5N to 44.3N, and σcs values are 1.0 to 1.53GPa. On the other hand, when film thickness is 5 μm, Lc values are 17.0 to 29.5N, and σcs values are 0.9 to 1.23GPa.
In addition, the film thickness and surface roughness of substrate have a large effects on the adhesive strength.departmental bulletin pape
Report on the first year of use of Nagano National College of Technology's bouldering wall
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Impact strength of the amorphous SiNxCy ceramic films by P-CVD method
Get PDFUsing a charge coupled plasma CVD apparatus, SiNxCy films (Si3N4-SiC, SiNx and SiCy system) are deposited from SiH4-90%Ar, NH3, C2H4 and H2 gases on a crown glass substrate. The impact absorption energy (E) or impact strength (IS) of the coated substrate was investigated.
The influence of composition from Si3N4 to SiC films was tested, for example. In the case of a film thickness of 5μm, the impact absorption energy (E ) changed from 68.1mJ (IS : 2.84kJ/m2) on the Si3N4 side to 78.1mJ (IS :3.25 kJ/m2) on the SiC side. But these energies were less than 50% of that of the substrate itself (E:159.2mJ, IS: 6.63 kJ/m2). Hard film coatings reduce impact strength.departmental bulletin pape
Analysis of Factors Forming Household Distribution Considering Annual Income Brackets - As a Framework of Nagano Urban Area -
Get PDFThis study analyzes the factors that form the number of households by annual income in the framework of residential induction zones. In order to verify the accessibility of living facilities from residents, we examined the relationship between accessibility to urban facilities and the level of activity in each distribution of residential areas in cities. In addition, the presence or absence of traffic nodes and natural disaster risk zones is also taken into account.departmental bulletin pape
YAG laser cutting of Si3N4, AlN, SiC ceramics and its mechanical property
Get PDFSi3N4, AlN and SiC ceramics with a relative density of 96.5% or more were processed by YAG laser cutting, and the change in strength due to the processing was evaluated.
When a single laser beam was irradiated, the beam depth ? increased in proportion to the energy E [J] of the laser beam. The relationship between E and ? is about 1J→0.6~0.8mm, 2J→0.9~1.1mm. The beam-hole diameter with conical shape was 0.15 to 0.22 mm at the irradiated surface. The Vickers hardness of the processed surface decreased to about 13-22%. The 3-point bending strength decreased to 33-45%. The surface roughness decreased greatly from 1/62 to 1/146. From the observation of the structure of the irradiated cross section, the structure melted by heat of laser beam was observed in Si3N4 and AlN, and the sintered structure with traces of processing was observed in SiC.departmental bulletin pape
Categories of Similes Used as Predicates
Get PDFThis paper categorizes predicative similes (predicate-type similes) based on actual examples. Previous research often assumes that the typical form of a simile is "A ha B no y?da," which uses the terminal form of the auxiliary verb "y?da." However, in practice, complex predicate forms such as "y? ni mieru" (appears like) connecting to formal verbs, or "y? na mono da" (is like something) connecting to formal nouns, are also used. In actual usage, adverbial modifying similes (e.g., "A ha B no y? ni C") are more common, and predicative similes are relatively rare. Nevertheless, predicative similes are easier to consider as model cases. Therefore, defining the range of forms that predicative similes can take is valuable as preliminary preparation for theoretical considerations of how similes are formed and what expressive value they hold.departmental bulletin pape
