0086-21-58386256
Comparison Of Al2O3, SiC, and B4C as Ballistic-Resistant Body Armor. Ceramic armor materials are intended to protect people and vehicles from ballistic damage. Currently, emphasis is placed on developing ceramics with properties that are difficult to achieve, such as high ballistic performance and low weight. ... "Investigation on the ...
Additive-free boron carbide (B 4 C) – silicon carbide (SiC) ceramic composites with different B 4 C and β-SiC powders ratio were densified using the high-pressure "anvil-type with hollows" apparatus at 1500 °C under a pressure of 4 GPa for 60 s in air. The effect of starting powders ratio on the composites sintering behavior, relative …
B4C–SiC composite ceramics exhibit a combination of the desirable performance of B4C and SiC, making them a better candidate material for engineering applications as structural ceramic materials.
With the advent of modernization, there is a need for advanced engineering materials for various engineering applications. The current study employs Al6061 as the matrix material. The reinforcing particles employed are SiC and B4C. Al6061–SiC–B4C hybrid composites are fabricated through the utilization of stir casting technology. The …
Various combinations of Al4C3, B4C, and carbon were used as sintering aids for pressureless sintering of alpha-SiC (94% 6H+ 6% 15R) powders. Densification behavior, polytypic transformation, microstructural development, and mechanical properties were studied. Appropriate amounts of Al4C3-B4C-C additions could facilitate alpha-SiC …
The effect of holes on the fatigue life of a non-oxide ceramic composite processed via chemical vapor infiltration (CVI) was examined at 1,200 °C in laboratory air and in steam. The effect of holes on tensile strength at 1,200 °C was also evaluated. The composite comprised laminated woven Hi-Nicalon™ fibers in an oxidation inhibited …
پودرهای سرامیکی و فلزی ... گلوله کاربید سیلیسیوم SiC گلوله نیترید سیلیسیوم Si3N4 گلوله کاربید سیلیسیوم ... سنگ های ساینده سرامیکی کاربید سیلیسیوم و اکسید آلومینیوم ...
DOI: 10.1007/s11106-023-00381-6 Corpus ID: 265440835; Tribological Properties of B4C–SiC–hBN Composite Ceramics Sliding Against AISI 347 Steel Immersed in Emulsion @article{Liang2023TribologicalPO, title={Tribological Properties of B4C–SiC–hBN Composite Ceramics Sliding Against AISI 347 Steel Immersed in Emulsion}, …
Finding a general procedure to produce a whole class of materials in a similar way is a desired goal of materials chemistry. In this work, we report a new bamboo-based carbothermal method to prepare nanowires of …
SiC-B4C eutectic ingot soli- dified at approximately 9cm/hr had considerably better wear re- sistance than solidified B4C or hot pressed SiC. Introduction In recent years considerable effort has been directed towards control- ling and improving the microstructure of nonmetallic materials. One method of controlling the microstructure is by the ...
Thermal conductivity of SiC-B4C materials obtained by reaction-sintering method. S N Perevislov 1, E S Motaylo 2, E S Novoselov 2 and D D Nesmelov 2. Published under licence by IOP Publishing Ltd IOP Conference Series: Materials Science and Engineering, Volume 848, Fifth interdisciplinary scientific forum with international …
Abstract Effect of hybridization on the rate-dependent behaviour of Aluminum metal matrix composites (MMCs) comprising (0, 10, 20, and 30%) monolithic and hybrid SiC–B4C were prepared by powder metallurgy technique and tested under quasi-static and dynamic compression. Split Hopkinson pressure bar results revealed diverse …
SiC-B4C composite ceramics show lower friction coefficients when the mass fraction of B4C is more than that of SiC. The low friction coefficients of 40 Wt.%SiC-60 Wt.% B4C composite ceramics (0.16) and 20 Wt.%SiC-80 Wt.% B4C composite ceramics (0.20) are attributed to the formation of a sufficient amount of H3BO3 layer, rather than the layer of ...
Fig. 2 (a) shows the SEM images for the prepared core-shell structured SiO 2 @C nanospheres. It can be seen that the SiO 2 @C nanospheres are uniform with an average size of about 440 nm. SiC/B 4 C nanowires were synthesized by using SiO 2 @C nanospheres as the raw material by a multi-step vapor-liquid-solid (VLS) process …
The nano hardness, Vickers hardness, and Young's modulus of 12 vol% B4C compared with 12 vol% of SiC are increased by 12%, 23%, and 16%, respectively, and the same trend has been observed for the ...
The formation and oxidation resistance of surface oxide layers formed on carbon-B 4 C-SiC composites with two different B 4 C-SiC ratios were investigated at elevated temperatures in dry and moist atmospheres. From SEM observation, X-ray diffraction analysis, EPMA, and ESCA measurements of the samples before and after …
Ternary B 4 C-SiC-ZrB 2 ceramics with eutectic compositions were prepared in situ by reactive spark plasma sintering at 1600–1800 °C. The two-step sintering, including an in situ reaction 2ZrSi 2 + 5B 4 C+ 3 C= 4B 4 C+ 4SiC+ 2ZrB 2 at 1600 °C and sintering at 1800 °C, is superior to combined one-step sintering at 1800 °C. The as-sintered 40B …
High active and ultrafme B4C-SiC composite powders were prepared by the coarse powders of B4C and SiC through the technology of mechanical alloying. Under …
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 …
Additive-free boron carbide (B 4 C) – silicon carbide (SiC) ceramic composites with different B 4 C and β-SiC powders ratio were densified using the high …
Although B4C-based composites exhibit excellent comprehensive mechanical properties, the microscopic strength and toughness mechanism are still unclear. In this paper, the B4C–ZrB2–SiC composites with excellent mechanical properties were prepared at 1900 °C and 45 MPa for 1 h using vacuum hot pressing assisted by reaction …
Carbides ceramic powders. Carbides combine the unique combination of low specific gravity; excellent elastic modulus and high hardness. Boron carbide (B4C), for example, …
هدف از این نو آوری دانش بنیان ، ارائه روشی برای بازیافت پودرهای ضایعات سیلیکون کارباید است که در آن ضایعات قطعات sic را می توان بر اساس یک روش مقرون به صرفه (کمتر از یک سوم قیمت جهانی) برای باز ...
DOI: 10.1016/j.jeurceramsoc.2020.02.062 Corpus ID: 214113511; Tribological properties of SiC-B4C ceramics under dry sliding condition @article{Zhang2020TribologicalPO, title={Tribological properties of SiC-B4C ceramics under dry sliding condition}, author={Wei Zhang and Seiji Yamashita and Hideki Kita}, journal={Journal of The European Ceramic …
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 ...
In this present study, optimization of drilling parameters in hybrid Al-6061/SiC/B4C/talc composites was studied using grey relational analysis. The purpose of this research was the investigation of the effect of drilling parameters on Al6061/SiC/B4C/talc composites fabricated using the stir casting. These hybrid …
Almost fully dense B 4 C-TiB 2-SiC composite ceramics with high flexure strength and good fracture toughness were fabricated through in-situ reaction between B 4 C, Ti 3 SiC 2 and Si using spark plasma sintering method at a relatively low temperature of 1650 °C. The intergranular and intragranular structure containing nanoparticles with …
B 4 C–SiC composite ceramics are a better candidate material for engineering applications as structural ceramic materials. The sintering performance, …
Reaction-bonded B4C-SiC composites are highly promising materials for numerous advanced technological applications. However, their microstructure evolution mechanism remains unclear. Herein, B4C-SiC composites were fabricated through the Si-melt infiltration process. The influences of the sintering time and the B4C content on the …
Hardness: B4C > SiC > Al2O3 > BN; Weight: B4C and SiC are lighter compared to Al2O3 and BN. Cost: Al2O3 is the most cost-effective, while B4C is the most expensive. Suitability: SiC and B4C are preferred for high-performance military applications, whereas Al2O3 is often used in cost-sensitive scenarios. BN, with its thermal properties, is ideal ...
SiC-B4C ceramic skeleton reinforced graphite composites (MCMB/SiC-B4C) with extraordinary mechanical performance were fabricated by SPS method. The influence of sintering temperature and volume ratio of B4C/SiC on the microstructure and mechanical performance of the composites was studied. With the introduction of B4C in the …
A unique optimized of core–shell structural B 4 C nanopowder, sintering aid additive of Si, and high-pressure sintering technique has been used to process nanocrystalline B 4 C–SiC ceramics with enhanced mechanical properties. C-coated B 4 C nanopowder was initially uniformly mixed with micron Si of different content by ball …
The average specific wear rates for Al+17%B4C, Al+17%SiC/B4C and Al+17%SiC composites are obtained about 49, 79 and 160 percent lower than aluminum wear rate under the same test conditions, respectively., – In the present study, composites were prepared by pressured infiltration technique. The employed composites are …