Influence of Infiltration Additives on the Phase, Microstructure and Oxidation Resistance of SiC Coating for Graphite Materials

2007 ◽  
Vol 336-338 ◽  
pp. 1756-1758
Author(s):  
Jian Feng Huang ◽  
Fei Deng ◽  
Li Yun Cao ◽  
Jian Peng Wu ◽  
Hong Jie Luo
Keyword(s):  
Weight Loss ◽  
High Temperature ◽  
Surface Structure ◽  
Oxidation Resistance ◽  
Graphite Substrate ◽  
Free Silicon ◽  
High Temperature Xrd ◽  
Oxidation Resistant ◽  
Pack Cementation Process ◽  
Sem Analyses

Oxidation resistant SiC coating for graphites was prepared by a pack cementation process with mixture powders of Si, C, SiC and some infiltration additives containing MgO, Al2O3 and Cr2O3. The influence of different infiltration additives on the phase, microstructure and oxidation resistance of SiC coating was primarily investigated. The results showed that adding infiltration additive in the pack powders is helpful for depositing denser SiC coating on graphite substrate; and the coating prepared by using MgO as infiltration additive exhibited better oxidation resistance at high temperature. XRD analyses revealed that SiC coating prepared by adding of MgO as infiltration additive possessed more free silicon; and the SEM analyses displayed that the free silicon could effectively fill the small holes of the SiC coating, which resulted in a perfect dense surface structure of SiC coating. Oxidation test showed that the as-prepared SiC coating could effectively protect graphite materials at 1500oC for 200 hours and the corresponding weight loss of the coated graphite was only 0.13%.

Environmental Resistant Coatings for High Temperature Mo and Nb Silicide Alloys

MRS Advances ◽  
2017 ◽  
Vol 2 (25) ◽  
pp. 1323-1334 ◽  
Author(s):  
J.H. Perepezko
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Environmental Performance ◽  
Self Healing ◽  
Temperature Oxidation ◽  
Environmental Resistance ◽  
Performance Constraints ◽  
Oxidation Resistant ◽  
Pack Cementation Process

ABSTRACTThe challenges of a high temperature environment impose severe material performance constraints in terms of melting point, oxidation resistance and structural functionality. In metallic systems the multiphase microstructures that can be developed in the Mo-Si-B system and Nb silicide alloys offer useful options for high temperature applications. Since the alloy compositions that exhibit the lowest oxidation rate will most likely not yield optimum mechanical properties performance, it is important to develop robust and compatible oxidation resistant coatings. An effective strategy to achieve the necessary environmental resistance is based upon the use of an integrated Mo-Si-B based coating that is applied by a pack cementation process to develop an aluminoborosilica surface and in-situ diffusion barriers with self-healing characteristics for enhanced oxidation resistance. The environmental performance requires resistance not only to high temperature oxidation, but also resistance to water vapor, CMAS (calcia-magnesia-aluminosilica) attack, hot corrosion and thermal cycling. Under these extended environmental conditions the Mo-Si-B based coating exhibits robust performance.

SANDVIK 7RE10

Alloy Digest ◽  
2001 ◽  
Vol 50 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Heat Treating ◽  
Resistant Alloy ◽  
Temperature Performance ◽  
Oxidation Resistant

Abstract Sandvik 7RE10 is a 25Cr/20Ni oxidation-resistant alloy with good carburization and oxidation resistance. It is typically used as furnace tubing. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-812. Producer or source: Sandvik.

ENHANCING HIGH-TEMPERATURE OXIDATION RESISTANCE OF TITANIUM ALLOY WITH KF110-B4C-Ag THROUGH LASER TECHNOLOGY

2021 ◽  
Author(s):  
ZHAO ZHANG ◽  
JIANING LI ◽  
ZHIYUN YE ◽  
CAINIAN JING ◽  
MENG WANG ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Mass Gain ◽  
Temperature Oxidation ◽  
Laser Technology ◽  
X Ray ◽  
Ta15 Titanium Alloy ◽  
Oxidation Resistant

In this paper, the high-temperature oxidation resistant coating on the TA15 titanium alloy by laser cladding (LC) of the KF110-B4C-Ag mixed powders was analyzed in detail. The scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS) images indicated that a good metallurgy bond between the fabricated coating/TA15 was formed; also the fine/compact microstructure was produced after a cladding process. The oxidation mass gain of TA15 was higher than that of the coating after LC process, which were 3.72 and 0.91[Formula: see text]mg[Formula: see text]cm[Formula: see text], respectively, at 60[Formula: see text]h, greatly enhancing the high temperature oxidation resistance.

Influence of Electrophoretic Deposition Voltage on the Phase, Microstructure and Property of a Nano-SiC Coating

2010 ◽  
Vol 434-435 ◽  
pp. 489-491
Author(s):  
Bo Wang ◽  
Jian Feng Huang ◽  
Miao Liu ◽  
Li Yun Cao ◽  
Xie Rong Zeng
Keyword(s):  
Weight Loss ◽  
Oxidation Resistance ◽  
Cross Section ◽  
Electrophoretic Deposition ◽  
Outer Layer ◽  
Deposition Process ◽  
Voltage Range ◽  
Deposition Voltage ◽  
Oxidation In Air ◽  
Sem Analyses

In order to improve the oxidation resistance of carbon/carbon (C/C) composites, a nano-SiC (SiCn) coating for SiC pre-coated C/C was prepared by a hydrothermal electrophoretic deposition process. The phase compositions, surface and cross-section microstructures of the SiCn coatings deposited at different voltages were investigated. XRD and SEM analyses show that SiCn outer layer without penetrative holes and cracks can be achieved at the deposition voltage range from 120 V to 210 V. The thickness and density of the SiCn coatings improve with the increase of deposition voltage. The multi-layer coatings deposited at 210 V can effectively protect C/C composites from oxidation in air at 1773 K for 202 h with a weight loss of 0.79%.

The role of microscopy in the alloy design of Ni- and Fe-based aluminides

1992 ◽  
Vol 50 (1) ◽  
pp. 168-169
Author(s):  
J.A. Horton
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Oxidation Resistance ◽  
Industrial Applications ◽  
Al Alloys ◽  
Ordered Alloys ◽  
Successful Control ◽  
Oxidation Resistant

During the last 10 years, there has been a resurgence of interest in ordered alloys for structural uses due to the discovery of the dramatic ductilizing effect of boron on grain boundaries in Ni3Al. With this discovery, it was hoped that the property of an increase in strength as the temperature is increased could be utilized as well as the excellent oxidation resistance. Now, alloys based on Ni3Al are in use in specialized industrial applications, such as high temperature forging dies and being tested for use as turbocharger rotors. Due to the successful control of the grain boundary strength in Ni3Al, other systems were reexamined. For example, Fe3Al was also thought to have inherently brittle grain boundaries, however it was found that with purer alloys the material failed by cleavage. Subsequently, development of practical, inexpensive, oxidation resistant alloys has proceeded. Fe3Al alloys are currently being tested for automobile exhaust applications.

Oxidation of Pentatitanium Trisilicide (Ti5Si3) Powder at High Temperature

2016 ◽  
Vol 868 ◽  
pp. 38-42 ◽  
Author(s):  
Jun-Ichi Matsushita ◽  
Tatsuki Satsukawa ◽  
Naoya Iwamoto ◽  
Xiao Ling Wang ◽  
Jian Feng Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicon Dioxide ◽  
Oxidation Resistance ◽  
Surface Film ◽  
High Hardness ◽  
Mass Gain ◽  
Titanium Silicide ◽  
High Melting Point ◽  
Oxidation Resistant ◽  
Resistant Layer

The oxidation of pentatitanium trisilicide (Ti5Si3) powder at high temperature was investigated in order to determine the suitability of this ceramic material for advanced application in an oxidation atmosphere at high temperature. Titanium silicide has been attracted for years as an engineering ceramics due to its high hardness, high melting point, and good chemical stability. The samples were oxidized from 300 to 1000 °C for 1 to 5 h in air. The mass changes were measured to estimate the oxidation resistance of the sample. The mass gain of the sample oxidized at 1000 °C for 5 h was about 26 % of the theoretical oxidation mass change. The commercial powder, Ti5Si3 showed an excellent oxidation resistance at 1000 °C, because the surface film of both titanium dioxide and silicon dioxide formed by oxidation acted as an oxidation resistant layer.

Oxidation Resistant of Silicon-Boron Pitch Carbonization Product

2013 ◽  
Vol 652-654 ◽  
pp. 356-361
Author(s):  
Xiao Hua Zuo ◽  
Xuan Ke Li ◽  
Zhi Jun Dong ◽  
Guan Ming Yuan ◽  
Zheng Wei Cui
Keyword(s):  
Weight Loss ◽  
High Temperature ◽  
Thermal Treatment ◽  
Treatment Method ◽  
Oxidation Temperature ◽  
Coal Pitch ◽  
Air Atmosphere ◽  
Carbonization Product ◽  
Ft Ir ◽  
Oxidation Resistant

The silicon-boron(Si-B) pitch was successfully synthesized by solution-thermal treatment method using coal pitch, polycarbosilane and borane pyridine as starting materials. The B-Si pitch carbonization product was attained by carbonization in the temperature 900°C under flowing argon. The Si-B pitch prepared and its carbonization product were characterized by SEM, FT-IR, TG-DSC and XRD. The results show that the carbonization product has C-Si and C-B bonds and the silicon and boron components of the product is still amorphous when it is treated at 900°C. The weight loss of the Si-B pitch carbonization product at 900°C for 12h in air atmosphere is only 3.76wt%. The weight loss of the product is less than 4 wt% when the oxidation temperature reaches 1180°C. The prepared B-Si pitch carbonization product possesses good anti-oxidation property at high temperature in air atmosphere.

Cyclic Oxidation Resistance of a Reaction Milled Nial-AlN Composite

1990 ◽  
Vol 194 ◽  
Author(s):  
Carl E. Lowell ◽  
Charles A. Barrett ◽  
J. Daniel Whittenberger
Keyword(s):  
Mechanical Property ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Alumina Scale ◽  
High Temperature Strength ◽  
Oxidation Resistant ◽  
Scale Composition

AbstractBased upon recent mechanical property tests a NiAl-AlN composite produced by cryomilling has very attractive high temperature strength. This paper focuses on the oxidation resistance of the NiAl-AlN composite at 1473 and 1573 K as compared to that of Ni-47Al-0.15Zr, one of the most oxidation resistant intermetallics. The results of cyclic oxidation tests show that the NiAl-AlN composite has excellent properties although not quite as good as those of Ni-47Al-0.15Zr. The onset of failure of the NiAl-AlN was unique in that it was not accompanied by a change in scale composition from alumina to less protective oxides. Failure in the composite appears to be related to the entrapment of AlN particles within the alumina scale.

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