Zirconium – Based Ceramic Targets for Producing Nanocrystalline Coatings Resistant to Heat and Thermal Creep

2010 ◽  
Vol 11 ◽  
pp. 89-94 ◽  
Author(s):  
Andrzej Roman Olszyna ◽  
Marek Kostecki
Keyword(s):  
Phase Stability ◽  
Zirconium Oxide ◽  
Chemical Structure ◽  
Type A ◽  
High Density ◽  
Thermal Barrier ◽  
Zro2 Powder ◽  
Nano Crystalline ◽  
Alternative Materials ◽  
Ceramic Targets

Technology of thermal ceramic barriers (TBC) has been chiefly designed for materials with a single thermal barrier of the 7YSZ type. A high content of Y2O3 ensures a good phase stability of the YSZ material. In search for other alternative materials suitable for TBC, the material most often examined is modified zirconium oxide. The modification consists of stabilizing the ZrO2 powder with Y2O3 and doping it with La, Gd and Nd. This paper presents the results of studies on producing cathodic zirconium oxide-based ceramic targets intended for depositing refractory heat-resistant nano-crystalline TBC coatings. The targets are characterized by a high density (close to its theoretical value) and have a homogeneous phase and chemical structure.

Mechanical and Thermal Properties of Ternary System Based on Starch-Grafted-Polyethylene/High Density Polyethylene/Halloysite Nanocomposites

2019 ◽  
Vol 800 ◽  
pp. 210-215
Author(s):  
Walid Fermas ◽  
Mustapha Kaci ◽  
Remo Merijs Meri ◽  
Janis Zicans
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Chemical Structure ◽  
Filler Content ◽  
Halloysite Nanotubes ◽  
High Density ◽  
Flexural Properties ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Content Ratio

In this paper, the effect of unmodified halloysite nanotubes (HNTs) content on the chemical structure and the thermal and mechanical properties of blends based on starch-grafted-polyethylene (SgP) and high density polyethylene (HDPE) (70/30 w/w) nanocomposites was investigated at various filler content ratios, i.e. 1.5, 3 and 5 wt.%. The study showed the occurrence of chemical interactions between the polymer matrix and HNTs through OH bonding. Further, the addition of HNTs to the polymer blend led to an increase in the crystallization temperature of the nanocomposite samples, in particular at higher filler contents i.e. 3 and 5 wt.%, while the melting temperature remained almost unchanged. Tensile and flexural properties of the nanocomposite samples were however improved compared to the virgin blend with respect to the HNTs content ratio.

Synthesis and Characterization of Porous Nano-Crystalline Barium Hexaferrite

2012 ◽  
Vol 622-623 ◽  
pp. 860-863
Author(s):  
S. Hamidizadeh ◽  
A. Ataie ◽  
Amin Nozari
Keyword(s):  
High Density Polyethylene ◽  
Single Phase ◽  
Barium Hexaferrite ◽  
Weight Percent ◽  
High Energy ◽  
High Density ◽  
Synthesis And Characterization ◽  
Polyethylene Composite ◽  
Nano Crystalline

Barium hexaferrite/high density polyethylene composite was prepared from synthesized barium hexaferrite as matrix with 0, 10, 20, 30, 40 wt.% of high density polyethylene via a high energy planetary ball milling for 10 h. The milling products were isostatically pressed and finally sintered at 1250 °C for 1 h. Effect of HDPE content on morphology of the products were investigated using scanning electron microscope (SEM). Vibrating samplemagnetometer (VSM) analysis of single phase BaFe12O19 indicates saturation magnetization and coercivity of 52 emu/g and 4300 Oe, respectively. Visually, as the weight percent of the HDPE increases, more porous structure was observed. Moreover, the density of the sintered sampleslinearly decreased from 4.16 to 1.41 g/cm3 by increasing the amount of HDPE from 0 to 40 wt.%.

Phase stability of thermal barrier oxides: A comparative study of Y and Yb additions

2007 ◽  
Vol 98 (12) ◽  
pp. 1177-1187 ◽  
Author(s):  
Julie M. Cairney ◽  
Noemi R. Rebollo ◽  
Manfred Rühle ◽  
Carlos G. Levi
Keyword(s):  
Comparative Study ◽  
Phase Stability ◽  
Thermal Barrier

Phase Stability of t′-Zirconia-Based Thermal Barrier Coatings: Mechanistic Insights

2011 ◽  
Vol 94 ◽  
pp. s168-s177 ◽  
Author(s):  
Jessica A. Krogstad ◽  
Stephan Krämer ◽  
Don M. Lipkin ◽  
Curtis A. Johnson ◽  
David R. G. Mitchell ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Phase Stability ◽  
Thermal Barrier ◽  
Barrier Coatings

Thermal Properties of Magnetron Sputtered TiN And TiAlN Thin Films on HSS

1996 ◽  
Vol 436 ◽  
Author(s):  
E. Lugscheider ◽  
O. Knotek ◽  
C. Barimani ◽  
H. Zimmermann ◽  
M. Lake
Keyword(s):  
Thermophysical Properties ◽  
High Speed ◽  
Chemical Structure ◽  
Chemical Resistance ◽  
Cutting Tools ◽  
Measuring System ◽  
Small Scale ◽  
Thermal Barrier ◽  
Pvd Coatings ◽  
Pin On Disc

AbstractIncreasing demands on production processes in terms of performance, reliability and environmental compatibility shape the specification profile for modem wear resistant coating systems. The specification of PVD coated cutting tools by the parameters hardness, wear and frictional behavior, chemical structure or chemical resistance are already known and inspected by small scale tests, e.g. pin on disc or taber abraser test. Hitherto the thermophysical properties of thin film PVD coatings were not characterized completely although the investigation of the thermal diffusivity of coated substrates give information about the thermal barrier function of the deposited coating.To determine the thermophysical properties of PVD coatings the Jenoptik Thermal Wave Inspection (TWIN) can be used. This nondestructive and contactless measuring system is based on the photothermal spectroscopy. In this paper fundamentals of the TWIN measuring technique are presented as well as first TWIN results of investigated MSIP TiN and TiAlN coated and oxidized high speed steels.

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