The structural and morphological characterization of electrodeposited cobalt tungsten alloys
Başlık çevirisi mevcut değil.
- Tez No: 760132
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Doktora
- Konular: Mühendislik Bilimleri, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: University of Leicester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 253
Özet
Özet yok.
Özet (Çeviri)
Traditional hexavalent hard chrome coatings produced from chromium trioxide are providing reasonable corrosion and wear resistance, which recognised as a carcinogen and its use controlled by reach legislation. Many researchers have investigated as the ability of Mo and W to codeposit with iron group metals (Ni, Fe, Co) to form crystalline and amorphous compounds and more recently, work has shown that nano-crystalline coatings may be produced with high hardness. In this thesis, Co-W electrodeposited coatings are investigated structurally, compositionally, and morphologically. Series of Co-W alloy coatings with variable structures and composition were obtained using a gluconate bath and a soluble Co anode at 80 °C temperature and 2.7 Adm-2 current density with air agitation. Some of these samples at the same compositions illustrate at different preferred growth directions of (100), (101), (002) and (110) and these differences occur due to variations in agitation. SEM/EDX and XRD and microhardness were employed to characterise the coatings and how they differ across the samples due to edge effects. Variation in W content of 2 – 3 at.% changes in W content of the coatings affect the hardness significantly up to around 50%. Coatings were selected for heat treatment process based on composition and preferred orientation. The effect on the structure and hardness of the coatings after heat treatment at 600 °C for the duration up to 160 hours was explored using XRD and SEM. Two of 20 at.% W electrodeposited coatings at (100) and (101) preferred growth direction examined on TEM as electrodeposited and after 2 hours heat treatment by sample preparations of ion beam vertically and horizontally to the coating in the cross section using nanotechnological developments. The wear behaviour some of these samples examined under dry sliding conditions.
Benzer Tezler
- Fotoelektrokimyasal uygulamalar için BiOCl temelli nanokompozitlerin elektrokimyasal sentezi ve karakterizasyonu
Electrochemical synthesis and characterization of BiOCl based nanocomposites for photoelectrochemical applications
ŞENGÜL TUĞBA ÖZEKEN BERBER
- Synthesis and characterization ofmanganese dioxide cathodes for Zn-ionbatteries
Başlık çevirisi yok
ABDURRAHMAN SAFA OKŞAŞ
- NiFeCu/Cu ve NiCu filmlerinin elektrodepozisyon tekniği ile üretimi, yapısal ve magnetik özelliklerinin incelenmesi
Production of NiFeCu/Cu and NiCu films by electrodeposition technique, investigation of structural and magnetic properties
UMUT SARAÇ
Doktora
Türkçe
2011
Fizik ve Fizik MühendisliğiEskişehir Osmangazi ÜniversitesiFizik Ana Bilim Dalı
PROF. DR. M. CELALETTİN BAYKUL
- Production and characterization of ceramic reinforced Ni-Cu metal matrix composites
Seramik takviyeli Ni-Cu metal matris kompozitlerinin üretimi ve karakterizasyonu
ALPERCAN KURDAŞ
Yüksek Lisans
İngilizce
2022
Metalurji MühendisliğiAnkara Yıldırım Beyazıt ÜniversitesiMalzeme Mühendisliği Ana Bilim Dalı
DR. ÖĞR. ÜYESİ BEGÜM ÜNVEROĞLU
- ZnO, ZnS, ZnSe, ZnTe'ün elektrokimyasal yöntemle sentezi ve karakterizasyonu
Synthesis and characterization of ZnO, ZnS, ZnSe, ZnTe by electrochemical method
FATMA BAYRAKÇEKEN NİŞANCI