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  • 1
    Electronic Resource
    Electronic Resource
    Flexural Strength of Superfine Grained Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1477-1480 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Si3N4- Si2N2O composites were fabricated with amorphous nano-sized silicon nitridepowders by the liquid phase sintering(LPS) method. The sintering temperatures ranged from 1500ºCto 1700ºC. Microstructure and component of the composites were performed by scanning electronmicroscopy (SEM) and X-ray diffraction (XRD). Results show that sintered body consists of Si2N2Oand β-Si3N4, with an average grain size about 1μm. The maximum value of flexural strength of thematerial is 680MPa when sintered at 1700°C. Transcrystalline cracking is the main fracturemechanism of the composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1477.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Wear Property of Superfine Grained Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 917-919 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Si3N4-Si2N2O composites were fabricated with amorphous nano-sized silicon nitride powdersby the liquid phase sintering. The mass loss, relative density and average grain size increase withincreasing sintering temperature. The average grain size is less than 500nm when the sinteringtemperature is lower than 1700˚C. Friction coefficient is from 0.35 for sintering temperature 1650˚C to0.74 for 1600˚C when the composites were worn by silicon nitride bearing ball. High hardness of 21.5GPaand relative wear resistance of 32 were observed at a sintering temperature of 1600˚C. The wear surfaceare very smooth and no grooving and subsurface fracture, which indicates that they are worn slightly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.917.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Superplastic Forming of Silicon Nitride at Low Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1249-1252 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Si3N4 ceramic bodies were prepared by liquid phase sintering (LPS) with the amorphous nano-sized Si3N4 powders. Nano-sized Al2O3 and Y2O3 powders were introduced as additives. XRD analysis showed that the sintered body consists of β-Si3N4 and Si2N2O which confirms that phase change temperature of β-Si3N4 islower than traditional Si3N4. SEM examination showed that the grain size of sintered body is smaller than 300 nm. Superplastic forming can be undertaken at the low temperature of 1550°C in a nitrogen atmosphere when the forming velocity is less than 0.5 mm/min. The formed parts rupture when the forming velocity is 1 mm/minor the forming temperature is 1500°C. Only a few defects are observed in the blank before forming, but many cavity groups are present in the formed workpiece
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1249.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Superplasticity and Sinter-Forging of Fine-Grained Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉-Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O Composite (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2987-2990 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Si3N4- Si2N2O composites are fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering(LPS) method in this article. XRD analysis shows that the sintered body consists of β-Si3N4 and Si2N2O. SEM experiment conforms that the average grain size of sintered body is less than 300nm. The superplastic deep-drawing forming can be proceed at a low temperature of 1550℃ with a forming velocity of 0.2mm/min. There are only a few small sintered defects before forming, but there are a lot of cavity groups after forming. Cavitation failure occurs by nucleation, growth and interlinkage of cavities. The complex-shape gears can be formed by a sinter-forging technology when the sintering temperature is 1600℃ and the superplastic forging temperature is 1550℃
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2987.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Precision Forging of Casting AZ31 Magnesium Inner Spur-Gear (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 13-16 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on the two-stage forming technology, the casting AZ31 Magnesium alloy bar wasforged into cylindrical straight inner gear between the temperature 250℃-400℃. At 250℃, the teethof the inner gear are almost formed. But there are some cyclic cracks on the surface of the sample.When improving the temperature above 300℃, the surface quality of the sample has greatlyimproved. According to the result of this experiment, the best temperature range for forging AZ31magnesium gear is 280℃ to 380℃.The forming load gradually reduced with the temperatureimproved. At 250℃, the forming load is 93t. At the 400℃, the forming load reduces to 80t.The initialgrain size of AZ31 magnesium alloy bar is 22μm. The microstructure evolution during the warmdeformation was observed by optical microscopy (OM). It is demonstrated that the grain refinementhappened during the deformation process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.13.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Superplastic Behaviors of Casting AZ31 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 237-240 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The superplasticity of magnesium alloy is important in industrial application. Howeverthe superplastic deformation of casting magnesium alloy is hard to be realized. In this paper, thestress–strain behaviors of casting AZ31 magnesium alloy with various strain rates at differentdeformation temperatures were investigated. The alloy was tested in the tensile condition withinitial grain size of 25μm. It was found that the elongation of the alloy at 400°C with ε&= 4.25×10-4s-1 is almost 200%. According to the results of uniaxial tensile experiment, the alloy exhibitedsuperplastic deformation behavior with the slow stain rate in a temperature range of 350 to 450°C.The microstructures deformed and undeformed samples were observed with aid of opticalmicroscope
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.237.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Superplastic Sinter-Forging of Fine-Grained Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉-Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O Composite at Low Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 487-490 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Si3N4- Si2N2O composites are fabricated with amorphous nano-sized silicon nitridepowders by the liquid phase sintering (LPS) method. XRD analysis shows sintered body consists ofβ-Si3N4 and Si2N2O. SEM experiment conforms that the average grain size of sintered body is lessthan 300nm. The complex-shape gears can be formed by a sinter-forging technology when thesintering temperature is 1600°C and the superplastic forging temperature is only 1550°C. Rod-shapedgrains aligned along the perpendicular direction of pressure and the mechanical properties increaseabout 10% after the materials were forged
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.487.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Hot Press Sintering and Superplastic Forming of Fine-Grained Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉-Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O Composites (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 25-28 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Si3N4- Si2N2O composites were fabricated with amorphous nano-sized silicon nitridepowders by the hot press sintering(HPS). The Si2N2O phase was generated by an in-situ reaction2Si3N4(s)+1.5O2(g)=3Si2N2O(s)+N2(g). The content of Si2N2O phase up to 60% was accepted whenthe sintering temperature was 1650℃ and decreased whether the sintering temperature was increasedor not, which indicated that the reaction was reversible. The mass loss, relative density and averagegrain size increased with raising of sintering temperature. The average grain size was less than 500nmif the sintering temperature was below 1700℃. The sintered body crystaled completely at 1600℃ .The microstructure crystaled in 1600℃ indicated that most of the grain size was in 150-250nm. Theaspect ratio of some grains reached 1.5. The superplastic deep-drawing forming could be undertakenat 1550℃ with a forming velocity of 0.2mm/min. The complex-shape gears could be formed by asinter-forging technology when the sintering temperature was 1600℃ and the superplastic forgingtemperature was 1550℃
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.25.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Superplastic Extrusion of Nano-Structured Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O-Sialon (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 497-500 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nano-structured Si2N2O-Sialon composites were prepared by liquid phase sinteringmethod with the amorphous nano-sized Si3N4 and nano-sized AlN powders. Nano-sized Al2O3 andY2O3 powders synthesized by polyacrylamide gel method were introduced as additives. SEMexamination shows the grain size of sintered body to be less than 80nm. Superplastic extrusion can beundertaken at 1550°C with a high velocity of 0.5mm/min and a big extrusion ratio of 3.57. There area lot ring-shaped structure just like “annual ring” of trees in radial fracture and clear flow trace in axialfracture, all which is very similar to deformed metal materials and approve good superplasticdeformation capability of Si2N2O-Sialon composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.497.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Liquid Phase Sintering Behavior of Amorphous Nano-Sized Silicon Nitride Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1069-1071 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The amorphous nano-sized silicon nitride powders were sintered by liquid phase sinteringmethod. Si3N4-Si2N2O composites were in-situ fabricated. The Si2N2O phase was generated by an in-situreaction 2Si3N4(s)+1.5O2(g)=3Si2N2O(s)+N2(g). The content of Si2N2O phase up to 60% was obtained ata sintering temperature of 1650°C and reduced when the sintering temperature increased or decreased,which indicates that the reaction is reversible. The mass loss, relative density and average grain sizeincrease with increasing of sintering temperature. The average grain size is less than 500nm when thesintering temperature is below 1700°C. During the sintering procedure, there is a complex crystallizationand phase transition: amorphous Si3N4 → equiaxial α-Si3N4→ equiaxial β-Si3N4 → rod-like[removed info]Si2N2O →needle-like β-Si3N4. Small round-shaped β-Si3N4 particles are entrapped in the Si2N2O grains and a highdensity of staking faults are situated in the middle of Si2N2O grains at a sintering temperature of 1650°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1069.pdf
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