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We fabricated boron carbide-silicon carbide (B 4 C–SiC) composites by hot-press sintering without additives and evaluated the crystal phase, relative density, microstructure, and mechanical properties of the sintered body. When B 4 C and SiC were uniformly dispersed in the composite, crystal growth was inhibited, and a sintered body with a fine and uniform …
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In the present study aluminium metal matrix composites (Al-MMCs) reinforced with different Wt% (2,3,4,5 and 6) of Silicon carbide (SiC) and hybrid composites of aluminium matrix reinforced with different Wt% (2,3,4,5 and 6) of SiC and constantly adding Boron carbide (B4C) with 2 wt% were fabricated using a cost effective powder metallurgy (PM) method and the …
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SiC-B 4 C composites with various values of SiC-to-B 4 C ratio and grain size were fabricated by pressureless sintering. This paper presents the results of current investigations …
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The current work involved the fabrication of B 4 C/SiC reinforced Al-Si alloys utilising the powder metallurgy process. The weight proportions of B 4 C were varied while maintaining SiC constant to study the influence of B 4 C reinforcement in improving hardness and compressive strength. The applied pressure for compacting and the temperature for sintering …
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Boron carbide (B4C) and its in situ composites were synthesized via a simple bottom-up process using low-cost boric acid and a sucrose-based precursor solution with silicon (Si), titanium (Ti), or zirconium (Zr) species. The precursor solution was first dried at 250 °C and then heat-treated at 1650 °C for 90 min under argon and hydrogen gas flow. Free boron oxide …
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B 4 C-TiB 2-SiC composites were fabricated via hot pressing using ball milled B 4 C, TiB 2, and SiC powder mixtures as the starting materials. The impact of ball milling on the …
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SiC-B4C ceramic composites with different ratios of SiC to B4C were produced. The relative density, mechanical properties, initial surface characteristics, dry sliding tribological properties ...
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The experimental yield strength of Al matrix is 204.2 MPa, the critical length of SiC nanowires is 22.86 μm, longer than the lengths of SiC nanowires, the failure modes of the interface between SiC nanowires and Al matrix are mostly interface debonding and nanowire pull-out as shown in Fig. 9 (d–f), so the load-transfer strengthening effect ...
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Boron carbide (B4C) is one of the most important opaque boride ceramics that has high hardness and Young's modulus that along with low density lead to a significant …
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Matović's team [32] showed that high pressure sintering was an effective low-temperature densification method for the preparation of addition-free B4C-β-SiC ceramic composites. TaC ceramic sintering process remains to be further improved and the influences of high-pressure sintering on the microstructures and properties of UHTCs were seldom ...
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Зүлгүүрийн нунтаг тоо - Непал орчуулга, тодорхойлол үг, ижил нэр, антоним, жишээг. Монгол-балбын орчуулга. OpenTran
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Contribute to yeahliangyy/ru development by creating an account on GitHub.
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Ажилд зориулсан зүлгүүрийн нунтаг ямар байх ёстой Таны ойлгож байгаагаар янз бүрийн зүлгүүрийн цаасыг янз бүрийн материалыг боловсруулахад ашигладаг.
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A B4C‐SiC composite without annealing and two B4C‐SiC composites followed by annealing at 1000 ℃ and 1200 ℃ for 1 h in air, respectively, were prepared.
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B4C-SiC composites with fine grains were fabricated with hot-pressing pyrolyzed mixtures of polycarbosilane-coated B4C powder without or with the addition of Si at 1950 °C for 1 h under the ...
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Two fully-dense B4C–SiC composites were fabricated by spark-plasma sintering (SPS) from B4C+Si powders, one superhard (i.e., ~28.7(8) GPa) with abundant SiC by SPS of B4C+20vol.%Si at 1400°C ...
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The addition of B4C is effective because (1) the mass density of B4C is lower than that of SiC, (2) its Young's modulus is higher than that of SiC, and (3) B4C is an effective additive for ...
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Уламжлалт зүлгүүр: Эдгээрт хөнгөн цагаан исэл (Al₂O₃) болон цахиурын карбид (SiC) зэрэг материалууд орно. Хөнгөн цагааны ислийг ихэвчлэн ган гэх мэт материалыг нунтаглахад …
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B4C–SiC–Si–TiB2 composites were synthesized by a two step process. TiB2 particles in the size range 2–5 μm were generated in situ in the first step and were distributed in the residual silicon present in the reaction bonded boron carbide, in the second step. The composites were characterized by X-ray diffraction (XRD), scanning ...
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While outstanding properties of boron carbide (B 4 C)-silicon carbide (SiC) composites make them potential candidates for ballistic and wear resistance applications, the applicability is rather limited due to processing challenges to obtain high density and superior mechanical properties. In the present work, B 4 C-10 wt% SiC composites are spark plasma …
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Preparing B4C-SiC-TiB2 composites via reactive pressureless sintering with B4C and TiSi2 as raw materials. lamei li. 2020, Journal of Materials Research and Technology. Boron carbide (B 4 C) is one of the super-hard materials. The hardness of B 4 C only ranks behind those of diamond and cubic boron nitride in the nature . B 4 C also shows ...
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Download scientific diagram | Phase diagram of SiC-B4C (a) and Si-B4C (b). from publication: Fabrication of Porous SiC by Direct Selective Laser Sintering Effect of Boron Carbide | Additive ...
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In this present work, B 4 C–TiB 2 –SiC composites were prepared by SPS using B 4 C, TiB 2, SiC powder mixtures.The addition of SiC can significantly improve the fracture toughness while maintaining high hardness. The B 4 C–TiB 2 –SiC composite exhibits superior mechanical properties thanks to the pinning effect of SiC particles, which makes the grain …
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The B4C-SiC composite has a lamella structure with SiC and B4C layers, whose eutectic composition was 53 mol% SiC. The angle between c-axis of B 4C matrix and growth direction was about 20°. Twin ...
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Therefore, B4C/SiC and B4C/Si3N4 tribo-pairs may exhibit outstanding tribological behaviors, while the tribological investigation is poor. In present investigation, we performed the friction tests ...
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As the composites were processed in air, the distribution of particles in Al-B4C is found better than Al-SiC and AlAl2O3. A reduction of porosity and a better (b) (c) Fig. 2 Optical micrographs showing the distribution particles in as-cast (a) Al-13vol%SiC, (b) Al13vol%Al2O3 and (c) Al-13vol%B4C composites.
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Фэн Эрда Групп нь янз бүрийн салбарын хэрэгцээг хангах үүрэгтэй бөгөөд нарийн үйлчилгээ, өндөр стандартын чанараар үйлчлүүлэгчдийн сэтгэлд нийцдэг.
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And by changing the content of SiC in the B 4 C-TiB 2-SiC composite, we proved that when the SiC content was 10 vol%, the ceramic composite obtained the best comprehensive performance, so designated amounts of 60 vol% B 4 C, 30 vol% TiB 2 and 10 vol% SiC were weighed. The powder mixtures were ball milled using a high-speed planetary mill (QXQM ...
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Титан нитридын нунтаг (TiN) Хөнгөн цагаан нитридын нунтаг (AlN) Цахиурын нитридын нано бөөмс; Бор карбидын нунтаг (B4C) Цахиурын карбидын нунтаг (β-SiC-p) Титан карбидын нунтаг (TiC) Титан диборид ...
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The oxidation behavior of C-SiC-B4C composite, with different sintering temperature and carbon content, at the temperature of 40-1400°C was investigated by TG/DTA, and the oxidation mechanism of ...
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