Bor nitrür üretimi

Download

T0RNeU9EZz0.pdf

Date

2008

Author

Özbelge, Önder H.
Katırcıoğlu, Bayram
Atılgan, İsmail
Özkol, Engin
Anutgan, Tamila Aliyeva
Anutgan, Mustafa

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

742
views

980
downloads

Bor nitrür, grafite çok benzer altıgen (h-BN) yapıda tabakalar halinde veya kübik yapıda (k- BN) elmasa çok yakın özelliklerde bulunabilir. k-BN bilinen malzemeler içinde elmastan sonra en sert olduğundan malzeme endüstrisinde sert metal kaplamalar yapmada (elmastan daha üstün özelliklerde, metal işlemede) kullanılmaktadır. Ayrıca, elmas sadece p-türü katkılanabildiği halde, k-BN hem p hem de n türü katkılanabilmektedir, ve dolayısıyla elektronik devrelerin yapı taşı olan p-n eklemini üretmek olası olduğundan mor-mavi ışık bölgesinde ışık algılayıcısı (detektör) ve yayınlayıcısı (LED) uygulamasına açıktır. k-BN tabanlı bu devre elemanlarının, opto-elektronik yatkınlıkları yanında, elmastan daha yüksek bir yasak enerji aralığına sahip olmalarından dolayı çok daha yüksek sıcaklık ortamlarında kullanılmalarını sağlanabilir. Son yıllarda yapılan araştırmalar k-BN’nin plazma ortamında Fiziksel Buhar Biriktirme (FBB) veya Kimyasal Buhar Biriktirme (KBB) yöntemleri ile üretilebileceğini göstermiştir. Ancak bu çalışmalar biriktirilen maddenin özelliklerine (k-BN içeriği ve mekanik gerilim) ve birikme hızına etki eden üretim parametrelerinin (kullanılan bor ve azot kaynakları, kullanılan gaz kompozisyonu, kaplanan yüzeyi oluşturan madde(taban), uygulanan plazma yoğunluğu, RF gücü, bias voltaj, taban sıcaklığı) nasıl etki ettiğini sistematik bir yaklaşımla incelememiştir. Elde, çevre birimleriyle birlikte, kurulu bulunan hem FBB, hem de KBB düzenekleriyle (yapılabilir bazı değişiklikler ve eklerle), yukarıda sözü edilen sistematik çalışma olanaklar çerçevesinde gerçekleştirilmiştir. Başka bir deyişle hem RF hem de MW kullanan KBB ve magnetron çığlama kullanan KBB teknikleriyle büyütülen filmler, eldeki ve proje bütçesiyle sağlanan olan ölçüm/test düzenekleriyle çözümlenmiştir. Böylece üretim test döngüsü yinelenerek hedeflenen mekanik ve opto-elektronik özellikte k-BN ince filmleri ve ondan üretilebilecek yapıları oluşturan en uygun üretim koşulları belirlenmeye çalışılmıştır.

URI

https://app.trdizin.gov.tr/publication/project/detail/T0RNeU9EZz0
https://hdl.handle.net/11511/49487

Collections

Department of Chemical Engineering, Project and Design

Suggestions

OpenMETU
Core

Production of boron nitride Özkol, Engin; Özbelge, Hilmi Önder; Department of Chemical Engineering (2008) Boron nitride is found mainly in two crystal structures; in hexagonal structure (h-BN) which is very much like graphite and in cubic structure (c-BN) with properties very close to those of diamond. h-BN is a natural lubricant due to its layered structure. It is generally used in sliding parts of the moving elements such as rotating element beds in turbine shafts. Since c-BN is the hardest known material after diamond it is used in making hard metal covers. In addition to its possible microelectronics applic...
Thermal plasma synthesis of boron carbide Altınok, Sertaç; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2018) Boron carbide is of interest for many applications due to unique combination of superior properties. These properties also make its production quite challenging. The net-shape boron carbide products are obtained by sintering of powders at high temperatures. So as to decrease the sintering temperature, initial particle size should be reduced to nanometer sizes. In this study, thermal plasma synthesis of boron carbide nanoparticles was investigated. For this purpose, radio frequency inductively coupled plasma...
Modelling, simulation, synthesis and structural characterization of Ni-Fe based nanoalloys Irmak, Ece Arslan; Mekhrabov, Amdulla O.; Akdeniz, Mahmut Vedat; Department of Metallurgical and Materials Engineering (2018) There is a growing interest in the simulation and production of nanoalloys because the unique chemical and physical properties of nanoalloys can be tuned, and completely new structural motifs can be created by varying the type and composition of constituent elements, the atomic ordering, size, and shape of the nanoparticles. As an important magnetic material, Fe-Ni based nanoalloys have promising applications in the chemical industry, aerospace and stealth industry, magnetic biomedical applications and comp...
Development of synthetic methodologies directed towards the generation of five membered ring allenes Algı, Fatih; Balcı, Metin; Department of Chemistry (2006) Chemists have always been fascinated by the cumulated diene system of allenes with its extraordinary properties such as the axial chirality of the elongated tetrahedron and a higher reactivity than non-cumulated C-C double bonds. The equilibrium geometry for an allene is linear with orthogonal pairs of substituents. An allene incorporated into a carbocyclic ring of nine or more carbon atoms is relatively unstrained. However, if the ring size is decreased, the linear perpendicular allene will be twisted and ...
Synthesis and structural characterization of bulk and nanoalloys of Ni-B binary systems Tekekaya, Halim Seçkin; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2019) Nanoalloys can exhibit features which are distinct than bulk form of the same alloys. Novel properties of Ni-B magnetic nanoalloys have been used in many application areas such as; biomedicine, catalysis, nano-electronics, targeted drug delivery, data storage, magnetic separation, magnetic recording media, etc. It has been also shown that boron notably affects and increases wear resistance and hardness in nickel based alloys. Nickel based alloys having boron content show a good resistance to abrasion and ga...

Citation Formats

Ö. H. Özbelge, B. Katırcıoğlu, İ. Atılgan, E. Özkol, T. A. Anutgan, and M. Anutgan, “Bor nitrür üretimi,” 2008. Accessed: 00, 2020. [Online]. Available: https://app.trdizin.gov.tr/publication/project/detail/T0RNeU9EZz0.