Laser surfacing of wear-resistant metal-ceramic coating on peat machines parts

2019 ◽  
Vol 12 (39) ◽  
pp. 26-35
Author(s):  
V.V. Meshkov ◽  
◽  
L.E. Afanasieva ◽  
1995 ◽  
Vol 76-77 ◽  
pp. 86-94 ◽  
Author(s):  
A.S. Osyka ◽  
A.I. Rybnikov ◽  
S.A. Leontiev ◽  
N.V. Nikitin ◽  
I.S. Malashenko

2011 ◽  
Vol 686 ◽  
pp. 521-527
Author(s):  
Ye Han ◽  
Shu Yu Yao ◽  
Wei Wei Zhang ◽  
Ming Gu ◽  
Yu Sui Yao

A novel wear resistant glass-ceramic coating system (based on SiO2-B2O3-Al2O3 glass system) on iron based substrate was developed. Friction coefficient, wear rate and coefficient of thermal expansion of coating material were evaluated using suitable methods. The coating materials and the resultant coatings were characterized using differential thermal analysis (DTA), X-ray diffraction analysis (XRD) and Scanning Electron Microscope (SEM). XRD analysis of the coating materials showed presence of a number of microcrystal. SEM micrographs indicate strong chemical bonding at the iron-ceramic interface. The coating material showed perfect properties for protection the iron substrate from abrasion.


Author(s):  
Наталья Витальевна Зайцева ◽  
Жанна Владимировна Вечеркина ◽  
Михаил Анатольевич Крючков ◽  
Виктор Сергеевич Калиниченко ◽  
Николай Валерьевич Морозов ◽  
...  

Вопреки доказанным преимуществам автоматизации зуботехнической лаборатории с помощью компьютерных технологий, изготовление металлокерамическмх несъемных коронок и мостовидных протезов остается востребованным в ортопедической стоматологи видом конструкции. Большой клинический опыт, отработанные технологии, надёжность и относительная простота изготовления дают им неоспоримые положительные качества. И главным моментов, определяющим их качество, долговечность и эффективность заключается в опыте, тандеме работы врача стоматолога-ортопеда и зубного мастера, и конечно же в грамотности выполнения пошаговой последовательности керамического моделирования облицовки выбранной комбинированной конструкции. Изготовление металлокерамических коронок небольшой толщины требует от зубного техника владения различными методиками нанесения керамической облицовки, знаний свойств и особенностей масс мировых производителей, тщательного соблюдения всех этапов и грамотной работы с цветовой палитрой. Создание металлокерамической конструкции предполагает последовательное получение металлического каркаса, на которй в последующем послойно наносят керамическую массу, а затем проводят ее обжиг. Среди технологических операций при создании облицовки цельнолитого металлического каркаса несъемного протеза из металлокерамики следует веделить следующие аспекты: подготовка каркаса протеза, выбор, подготовка и нанесение керамической массы, моделирование и обжиг грунтового слоя, нанесение дентинной массы, этап глазурирования. В научной работе, проведенной сотрудниками кафедры пропедевтической стоматологии ранее, дана характеристика методов моделирования керамической массы, были подробно изложены основные аспекты по обработке керамической массы горячим воздухом, формированию основного слоя керамического покрытия. В последующем, убедившись в высоком качестве грунтового покрытия, переходят к моделированию и обжигу дентинного слоя керамики. В данной статье описана подробная техника нанесения компоненотов керамических масс на опаковой слой керамической массы. Представленный метод трехэтапного нанесения керамического покрытия при изготовлении металлокерамических зубных протезов отвечает всем требованиям моделирования керамики. Следует обратить внимание на точное соблюдение правил послойного нанесения и конденсации керамических масс. Нанесение отдельных слоев керамической массы предполагает наличие опыта у зубного техника Despite the proven advantages of dental laboratory automation using computer technologies, the production of metal-ceramic fixed crowns and bridges remains a popular type of construction in orthopedic dentistry. Extensive clinical experience, proven technologies, reliability and relative ease of manufacture give them undeniable positive qualities. And the main factor that determines their quality, durability and effectiveness is the experience, the tandem work of the dentist-orthopedist and dental master, and of course the literacy of performing a step-by-step sequence of ceramic modeling of the selected combined structure. The production of metal-ceramic crowns of small thickness requires the dental technician to know various methods of applying ceramic cladding, to know the properties and features of the world's leading manufacturers, to carefully observe all stages and to work correctly with the color palette. The creation of a metal-ceramic structure involves the sequential production of a metal frame, on which the ceramic mass is subsequently applied in layers, and then it is fired. Among the technological operations when creating the veneer-cast metal framework removable denture-metal should be wadelite the following aspects: preparation of a denture, the choice, preparation and application of the ceramic mass, the modeling and firing the base coat, applying the dentinal mass, the stage of glazing applications. In the scientific work carried out by the staff of the Department of propaedeutic dentistry earlier, the characteristic of methods for modeling the ceramic mass was given, the main aspects of processing the ceramic mass with hot air, and the formation of the main layer of the ceramic coating were described in detail. After making sure that the high quality of the ground coating is used, they proceed to modeling and firing the dentin layer of ceramics. This article describes a detailed technique for applying ceramic mass components to the opaque layer of the ceramic mass. The presented method of three-stage application of ceramic coating in the manufacture of metal-ceramic dentures meets all the requirements of modeling ceramics. You should pay attention to the exact observance of the rules of layering and condensation of ceramic masses


2009 ◽  
Vol 27 (6) ◽  
pp. 996-1003 ◽  
Author(s):  
D. Vallauri ◽  
B. DeBenedetti ◽  
L. Jaworska ◽  
P. Klimczyk ◽  
M.A. Rodriguez

Author(s):  
Xiaoman Zhang ◽  
Yang Mu ◽  
Shuai Shao ◽  
Collin Wick ◽  
Ramu Ramachandran ◽  
...  

Mechanical failures of interfacial regions of ceramic-coating/metal-adhesion-layer/substrate systems were measured quantitatively and observed concurrently through instrumented microscale mechanical testing in-situ a scanning electron microscope (SEM). Failure of the interfacial regions of coating/interlayer/substrate systems was observed in micro-pillar specimens in-situ under different loading conditions, including shear, compression, and tension. Under shear loading, shear failure of the interfacial region was observed to occur in two stages: an initial uniform shear plastic deformation of the entire metal interlayer followed by an unstable shear-off close to the metal/ceramic interface. Additional testing under compression loading conditions suggests that the unstable shear-off is concomitant with the metal/ceramic interface going from being “locked”, with no relative displacement between materials on the two sides of the interface, to being “unlocked”, with significant relative displacements. Failure of the interfacial region was also observed under tensile loading conditions. Density functional theory (DFT) and molecular dynamics (MD) studies on one particular metal/ceramic interface, namely Ti/TiN, showed that a weak interaction plane exists in the metal layer near the chemical interface in a coherent Ti/TiN structure. Consequently, the free energy and theoretical shear strength of the semi-coherent Ti/TiN interface is found to depend on the physical location of the misfit dislocation network (MDN). The minimum energy and strength of the interface occur when the MDN is near, but not at the chemical interface. The present work gives new insight into the nature of mechanical failure of metal/ceramic interfaces, is relevant to materials-based engineering of metal/ceramic interfaces, and has applications to engineering of ceramic coating/substrate systems.


2004 ◽  
Vol 53 (10) ◽  
pp. 859-869 ◽  
Author(s):  
A. de la Isla ◽  
S. Pacheco ◽  
M. Estevez ◽  
S. Vargas ◽  
V. Castaño ◽  
...  

2016 ◽  
Vol 2 (1) ◽  
pp. 31-34
Author(s):  
Nicola Vogt ◽  
Katarzyna Wozniak ◽  
Armando Salito ◽  
Michael de Wild

AbstractSensitisation to immunologically active elements like chromium, cobalt or nickel and debris particle due to wear are serious problems for patients with metallic implants. We tested the approach of using a hard and thick ceramic coating as a wear-resistant protection of titanium implants, avoiding those sensitisation and foreign body problems. We showed that the process parameters strongly influence the coating porosity and, as a consequence, also its hardness.


2013 ◽  
Vol 750-752 ◽  
pp. 2200-2205 ◽  
Author(s):  
Cheng Fan

In this presented work, a coupled thermo-mechanical model is employed to analyze the thermo-mechanical behavior of ceramic functionally graded materials (FGMs) and the crack formation and propagation process of ceramic coating was simulated step in step and step by step using the RFPA (Realistic Failure Process Analysis) 2D-Thermo code. The thermal shock fracture behavior is discussed based on the basis of the simulated crack morphology and elucidated the mechanism of crack deformation and crack propagation. The state change from compression to tension whose magnitude is large enough to exceed the tension strength of ceramic causes the vertical crack. The numerical results agreed well with the experimental results in the previous literature.


Author(s):  
A. V. Kolomeychenko ◽  
◽  
I. N. Kravchenko ◽  
R. Yu. Solovyov ◽  
M. N. Erofeyev ◽  
...  

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