http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Bakhshi Saeed Reza (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Mohammad Erfanmanesh,Saeed Reza Bakhshi,Mohammad Reza Pakmanesh,Masoud Barekat 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
In this work, the wear performance of nano- and ordinary MoSi2plasma-sprayed coating on Ni substrate are compared. MoSi2nanopowder is prepared by ball milling followed by heat treatment processes. Atmospheric plasma spraying withargon atmosphere protection has been used to deposit the powders onto the nickel substrate. Ni substrate, MoSi2coating,and nano-MoSi2 coating were subjected to reciprocating wear test. Wear tests were done on a pin on plate machine by slidingMoSi2coating and substrates without coating against 52100 steel as the pin, at a temperature of 27 °C in dry condition. A friction coefficient of 0.18 ± 0.1 is obtained for nanostructured MoSi2coating, whereas a friction coefficient of 0.2 ± 0.1is obtained for conventional MoSi2coating under normal load of 20 N. Wear performance of nanostructured MoSi2coatingwas better as compared to the conventional MoSi2coating. The three observed dominant types of wear mechanisms wereadhesive, oxidation and abrasive. Morphologies and phases of coating, wear tracks, wear debris and counterpart steel pinswere evaluated by SEM with EDS and X-ray diffraction. The microhardness and adhesion strength of nanostructured MoSi2coating are determined by 1000 HV and 27 MPa, respectively.
-
Ghasemi Arman,Ramazani Mazaher,Bakhshi Saeed Reza,Al-Khafaji Ali Hussein Demin,Zahabi Saeed,Loghman Estarki Mohammad Reza,Zamani Abbas 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.4
This research aims to fabricate and develop a composite brake disc made of carbon/silicon carbide. For this purpose, the first silicon carbide nanoparticles were ultrasonicated with alumina sintering aid and carbon fi ber (between 10 and 20%) with different lengths of 3 mm, 10 mm, and 15 mm. Next, the fi nal Cf/SiC composite bulk was made-up via the spark plasma sintering (SPS) method. After that, the effect of different lengths of carbon fiber was explored on the porosity, coefficient of friction, fracture toughness, thermal conductivity, and microhardness of samples. The results showed that the density of sintered samples with a carbon fiber length of 10 mm was higher than that of samples with fiber lengths of 3 and 15 mm. Also, the hardness (25.79 GPa) and fracture toughness (5.72 MPa.m 1/2) of this sample were higher than those of the samples sintered with carbon fiber lengths of 3 and 15 mm. Further, this sample with the maximum density showed a coefficient of friction (COF) of 0.43. Since for aeroplane brake discs, the COF should be between 0.3 and 0.4, and the porosity of sam- ples should range within 3–5%, the samples sintered with the carbon fiber length of 10 mm had the nearby features to the preferred air brake disc indices.
-
Effect of TaB2 on densification and hardness of tantalum carbide/boride composites
Behzad Mehdikhani,Gholam Hossein Borhani,Saeed Reza Bakhshi,Hamid Reza Baharvandi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
Tantalum carbides/boride composite were synthesized by spark plasma sintering (SPS), using the powder mixtures of TaC andB4C as the starting materials. In this work densification, phase formation, microstructures, and mechanical properties of thematerials were investigated. The densification of tantalum carbide (TaC) was enhanced by adding 2.0 wt% B4C, reaching 97%relative density by SPS at 1900 oC using a 30 MPa applied pressure. X-ray diffraction analysis identified two phases, TaC andtantalum diboride (TaB2), with no peak shifts, indicating a solid solubility was not significant at these temperatures. Densificationof TaC was enhanced while the grain growth was suppressed by adding 2 wt% B4C, which allowed mechanical properties to beanalyzed. Relative density of > 97% was achieved for TaC with B4C additions by SPS at 1900 oC. By comparison, additive-freeTaC could be sintered to only 76% relative density at 1900 oC. The effect of B4C addition and sintering temperature on hardnessmeasured by microhardness has been studied. Hardness of samples contain 2.0 wt% B4C was 15.10 vickers.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
