Fiber Coating Performance in TiAl

1994 ◽  
Vol 350 ◽  
Author(s):  
C. McCullough ◽  
R. R. Kieschke
Keyword(s):  
Mechanical Properties ◽  
Interfacial Reaction ◽  
Transport Problem ◽  
Transport Rate ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Chemical Behavior ◽  
Coating Performance ◽  
Fiber Coating ◽  
Alternative System

AbstractThe interfacial chemical behavior of two candidate coating systems for use on fine diameter (∼10 μm) Al2O3 in TiAl is presented. The performance of the Nb/Y2O3 system appears to be related to the transport rate of Ti through the Y2O3 layer. Interfacial reaction is then observed at points where the Y2O3 thickness is less than about 1 μm. The main reaction product formed appears to be an oxygen saturated TiAl phase. An alternative system, C/TiN/Y2O3 is then presented as a solution to the Ti transport problem and may offer more desirable interfacial mechanical properties.

Effect of Directional Solidification Condition on Interfacial Reaction between DD6 Single Crystal Superalloy and Zirconia-Silica Ceramic Core

2014 ◽  
Vol 926-930 ◽  
pp. 72-76
Author(s):  
Li Li Wang ◽  
Jia Rong Li ◽  
Ding Zhong Tang ◽  
Guo Hong Gu ◽  
Xin Li ◽  
...  
Keyword(s):  
Single Crystal ◽  
Directional Solidification ◽  
Interfacial Reaction ◽  
Optical Microscope ◽  
Single Crystal Superalloy ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Solidification Condition ◽  
Al Content ◽  
Interdependent System

The characterization of the interfaces between DD6 single crystal superalloy and zirconia-silica (ZrO2-SiO2) ceramic cores was performed by optical microscope (OM), SEM and EDS analysis in order to study the influence of directional solidification condition on the interfacial reaction. The results showed that there were chemical reactions on interfaces between DD6 melt and ZrO2-SiO2ceramic cores and the main reaction product was Al2O3. The interfacial reaction involved a complex, interdependent system including the oxidation of Al element, the destabilization of calcia stabilization zirconia (CSZ) and the formation of liquid phase with low melting point. The intensity of interfacial reaction increased with the increase of pouring temperature and solidification time, but the number and size of reaction zones could not increase together because of the limited Al content in DD6 alloy.

Investigations on Phosphate Cements Hardening at Room Temperature

1989 ◽  
Vol 179 ◽  
Author(s):  
Alfred Zurz ◽  
I. Odler ◽  
B. Dettki
Keyword(s):  
Ultimate Strength ◽  
Room Temperature ◽  
Main Reaction ◽  
Main Reaction Product

AbstractPastes prepared from diammonium orthophosphate and calcined magnesia, MgO, exhibit a fast setting and hardening associated with NH3 liberation. Struvite, MgNH4PO4.6H2O, was found to be the main reaction product. Pastes made with NaH2PO4 or Na-polyphosphate exhibit a similar hardening reaction. The hardening reaction may be retarded and the ultimate strength moderately increased by adding appropriate retarders, such as Na2B4O7 10H2O to the system. The quality of the used MgO and its fineness has a significant effect on the rate of the hardening reaction.

scholarly journals Oxidative Destruction of Vulcanized by Changing the Dispersion Composition of Oxidized Vulcanized

2021 ◽  
pp. 207-214
Author(s):  
Milen Dimov ◽  
Zhuldyz Smailova
Keyword(s):  
Nitric Acid ◽  
Ir Spectra ◽  
Structural Changes ◽  
Main Reaction ◽  
Chemical Heterogeneity ◽  
Main Reaction Product ◽  
Oxidative Destruction ◽  
Rubber Component ◽  
Acetone Extracts ◽  
Dispersion Composition

The aim of the present work is to study the processes of oxidative destruction of waste vulcanizates (flakes) with nitric acid. The composition of the particles of the main reaction product was determined (oxidized vulcanized). The IR spectra of hexane and acetone extracts of the oxidized vulcanizates are also presented. It was found that the rubber component of the vulcanizates undergoes deep structural changes leading to the formation of products characterized by chemical heterogeneity

scholarly journals Hundred Years of Lactitol: From Hydrogenation to Food Ingredient

2020 ◽  
Author(s):  
Sergio I. Martinez-Monteagudo ◽  
Kaavya Rathnakumar ◽  
Maryam Enteshari ◽  
Collette Nyuydze ◽  
Juan C. Osorio-Arias ◽  
...  
Keyword(s):  
Historical Development ◽  
Main Reaction ◽  
Chewing Gum ◽  
Main Reaction Product ◽  
Food Ingredient ◽  
First Report

The first report on the synthesis of lactitol dates back to the early 1920s. Nearly 100 years have passed since then, and the applications of lactitol have exceeded its original purpose. Currently, lactitol is used in bakery, confectionery, chocolate, desserts, chewing gum, cryoprotectant, delivery agent, and stabilizer in biosensors. Lactitol is the main reaction product derived from the hydrogenation of lactose. This chapter is aimed at providing a succinct overview of the historical development of lactitol, a summary of its synthesis, and an overview of its properties and applications.

THE SOLVOLYSIS OF THE ALPHA- AND BETA-3,4,6-TRI-O-ACETYL-D-GLUCOPYRANOSYL CHLORIDES

1955 ◽  
Vol 33 (1) ◽  
pp. 128-133 ◽  
Author(s):  
R. U. Lemieux ◽  
G. Huber
Keyword(s):  
Acetic Acid ◽  
Double Bond ◽  
Positive Charge ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Double Bond Character ◽  
Ionic Reactions ◽  
Oxygen Bond ◽  
Bond Character ◽  
Anomeric Center

3,4,6-Tri-O-acetyl-β-D-glucopyranosyl chloride was found to undergo solvolysis in acetic acid to form 1,3,4,6-tetra-O-acetyl-α-D-glucopyranose as the main reaction product. The much less reactive anomeric α-chloride also appeared to undergo solvolysis with extensive inversion of the anomeric center. It is submitted that the tendencies for inversion obtained in these ionic reactions are due to the conformations imposed on the intermediate ions through distribution of the positive charge to the ring oxygen and the consequent introduction of double-bond character to the carbon-1 to ring-oxygen bond.

Effects of Thickness Ratio on Interface Characteristic and Mechanical Properties of Ti/C Laminated Composites

2011 ◽  
Vol 418-420 ◽  
pp. 1498-1501
Author(s):  
Wen Yuan Long ◽  
Pei Pei Li
Keyword(s):  
Mechanical Properties ◽  
Interfacial Reaction ◽  
Reaction Layer ◽  
Bending Strength ◽  
Laminated Composite ◽  
Thickness Ratio ◽  
Plasma Sintering ◽  
Interface Characteristics ◽  
Spark Plasma ◽  
Laminated Composite Material

The Ti/TiC/C laminated composite material was fabricated with the sheet of Ti and C by spark plasma sintering (SPS) technology. The effects of thickness ratio on the interface characteristics and mechanical properties of interfacial reaction were studied. The results show that: the reaction layer thickness increases with the thickness ratio. When the thickness ratio was 3:1, the degree of interfacial reaction was better in the case of other conditions are the same. The thickness of reaction layer achieved 33.58μm. The laminated composite bending strength and fracture power reached the maximum 3494.52MPa and 614.89×103J/m2, respectively. The greater fracture power, the more energy absorbed in the process of damage, the higher toughness improved.

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