scholarly journals Determining the influence of the microstructure and phase composition of glass-metal-ceramic coatings on their basic physical-technical properties

2021 ◽  
Vol 6 (12 (114)) ◽  
Author(s):  
Elena Karasik ◽  
Yurii Hordieiev
Keyword(s):  
Phase Composition ◽  
Ceramic Coatings ◽  
High Heat ◽  
Metallic Nickel ◽  
Homogeneous Distribution ◽  
High Quality ◽  
Heat Resistant ◽  
Metal Ceramic ◽  
Distribution Of Components ◽  
Glass Metal

Given the development of new heat-resistant nickel alloys that operate at temperatures up to 1,250 °C, as well as the introduction of additive technologies for the production of various parts, it is a relevant task to devise new compositions of highly heat-resistant coatings. Determining the influence of the phase composition of glass-metal-ceramic coatings on its basic properties could improve the effectiveness of protecting those parts that operate under extreme conditions. Therefore, it is promising to conduct a study aimed at establishing the relationship between the microstructure and phase composition of glass-metal-ceramic coatings and the main physical-technical characteristics. This study's results have established that the most high-quality coatings were obtained on the basis of non-crystallizing glass. Such glass is characterized by a temperature coefficient of linear expansion of 92·10-7 degrees-1, a glass transition temperature of 625 °C, and surface tension of 260·10-3 N/m at 850 °C. These properties contribute to the formation of a defect-free coating, providing uniform spreading and high-quality adhesion to the substrate. The resulting optimal coating is characterized by the adhesion strength of 98 %, the thermal resistance (mode 950↔20 °C) of 50 cycles, and the high heat resistance (a weight gain after 100 h in the temperature range of 1,000‒1,050 °C) of 0.03 g/m2·h. Coatings with a minimum amount of glass bonding are distinguished by uniformity and high quality. The optimal ratio of phases "glass:metal-ceramic composition" is 10:90. The structure of the recommended coating is uniform, characterized by the homogeneous distribution of components, the absence of cracks, visible defects, and high quality. The phase composition of the coating after firing is represented by crystals of metallic nickel and silicon, as well as a small amount of residual glass phase.

THEORETICAL GROUNDS FOR FORMATION OF HIGH QUALITY METAL-CERAMIC COATINGS BY CARBOVIBRATING ELECTRODE ARC STRENGTHENING

2020 ◽  
pp. 2-11
Author(s):  
N. V. TITOV ◽  
◽  
A. V. KOLOMEYCHENKO ◽  
V. L. BASINYUK ◽  
I. N. KRAVCHENKO ◽  
...  
Keyword(s):  
Ceramic Coatings ◽  
High Quality ◽  
Metal Ceramic ◽  
Quality Metal

CRONIFER II EXTRA, CRONIFER 45, CRONIFER III EXTRA, CRONIFER IV EXTRA

Alloy Digest ◽  
1992 ◽  
Vol 41 (6) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
High Heat ◽  
Heat Resistant

Abstract CRONIFER II EXTRA, 45, III EXTRA AND IV EXTRA alloys are high heat resistant alloys, some with resistance to green rot and hardening environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. Filing Code: Ni-405. Producer or source: VDM Technologies Corporation.

High Heat-Resistant and Degradable Polybenzoxazines with a Diacetal Structure

2021 ◽  
Author(s):  
Peng Wang ◽  
Shuai Zhang ◽  
Wanghezi Xu ◽  
Tianming Xiao ◽  
Qichao Ran
Keyword(s):  
High Heat ◽  
Heat Resistant

scholarly journals Molecular Physiological Characterization of a High Heat Resistant Spore Forming Bacillus subtilis Food Isolate

2021 ◽  
Vol 9 (3) ◽  
pp. 667
Author(s):  
Zhiwei Tu ◽  
Peter Setlow ◽  
Stanley Brul ◽  
Gertjan Kramer
Keyword(s):  
Bacillus Subtilis ◽  
Heat Resistance ◽  
Dipicolinic Acid ◽  
Laboratory Strain ◽  
High Heat ◽  
High Heat Resistance ◽  
Vegetative Cells ◽  
Heat Resistant ◽  
Food Isolate ◽  
Wet Heat

Bacterial endospores (spores) are among the most resistant living forms on earth. Spores of Bacillus subtilis A163 show extremely high resistance to wet heat compared to spores of laboratory strains. In this study, we found that spores of B. subtilis A163 were indeed very wet heat resistant and released dipicolinic acid (DPA) very slowly during heat treatment. We also determined the proteome of vegetative cells and spores of B. subtilis A163 and the differences in these proteomes from those of the laboratory strain PY79, spores of which are much less heat resistant. This proteomic characterization identified 2011 proteins in spores and 1901 proteins in vegetative cells of B. subtilis A163. Surprisingly, spore morphogenic protein SpoVM had no homologs in B. subtilis A163. Comparing protein expression between these two strains uncovered 108 proteins that were differentially present in spores and 93 proteins differentially present in cells. In addition, five of the seven proteins on an operon in strain A163, which is thought to be primarily responsible for this strain’s spores high heat resistance, were also identified. These findings reveal proteomic differences of the two strains exhibiting different resistance to heat and form a basis for further mechanistic analysis of the high heat resistance of B. subtilis A163 spores.

Adhesive strength of heat-resistant glass ceramic coatings with nichrome melts

1994 ◽  
Vol 51 (2) ◽  
pp. 85-90
Author(s):  
A. P. Zubekhin ◽  
V. A. Zhabrev ◽  
A. M. Kondyurin
Keyword(s):  
Adhesive Strength ◽  
Glass Ceramic ◽  
Ceramic Coatings ◽  
Heat Resistant ◽  
Glass Ceramic Coatings

scholarly journals A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane

2012 ◽  
Vol 20 (21) ◽  
pp. 23659 ◽  
Author(s):  
Takato Ono ◽  
Yuichiro Hori ◽  
Masato Yoshida ◽  
Toshihiko Hirooka ◽  
Masataka Nakazawa ◽  
...  
Keyword(s):  
Saturable Absorber ◽  
High Heat ◽  
Heat Resistant

scholarly journals Design high heat-resistant stereocomplex poly(lactide acid) by cross-linking and plasticizing

2017 ◽  
Vol 37 (7) ◽  
pp. 2429-2435 ◽  
Author(s):  
Li Cui ◽  
Yahui Wang ◽  
Rundong Zhang ◽  
Yun Liu
Keyword(s):  
High Heat ◽  
Cross Linking ◽  
Heat Resistant

Influences of Calcination Ambiences on Phase Composition and High Temperature Oxidation Resistance Property of Ceramic Coatings on Ti–6Al–4V Alloy by Micro-Plasma Oxidation

2007 ◽  
Vol 336-338 ◽  
pp. 2481-2483 ◽  
Author(s):  
Guo Dong Hao ◽  
Zhao Hua Jiang ◽  
Zhong Ping Yao ◽  
Heng Ze Xian ◽  
Yan Li Jiang
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Ceramic Coatings ◽  
Plasma Oxidation ◽  
Temperature Oxidation ◽  
Complete Decomposition ◽  
Weight Gains ◽  
High Temperature Calcination

Compound ceramic coatings with the main crystalline of Al2TiO5 (as-coated samples) were prepared on Ti-6Al-4V alloy by pulsed bi-polar micro-plasma oxidation (MPO) in NaAlO2 solution. The coated samples were calcined in Ar and air at 1000oC, respectively. The phase composition, morphology and element content of the coatings were investigated by XRD, SEM and XRF. The samples treated in Ar and the as-coated ones were calcined in air at 1000oC to study the oxidation resistance of the samples. The results showed that Al2TiO5 decomposed and transformed into corundum and rutile TiO2 during the high temperature calcination. Al2TiO5 decomposed very quickly in air and the proportion of Al2O3 to TiO2 was 44:55 after a complete decomposition. On the contrary, Al2TiO5 decomposed very slowly in argon with the final proportion of Al2O3 to TiO2 of 81:18 on the coating surface. The morphology of the ceramic coatings after the calcination was also different. The coatings calcined in argon were fined: the grains and pores were smaller than those of the coatings calcined in air. The weight gains of both coatings changed in the form of parabola law, and the weight gains of the coated samples treated in argon were comparatively lower than that of the as-coated samples. During the high temperature calcination, the samples treated in argon cannot distort easily, compared with the as-coated ones.

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