In-Situ Reactions and Properties of Alumina-Magnesia Refractory Castables with Addition of TiO2

2015 ◽  
Vol 64 (3) ◽  
pp. 104-107
Author(s):  
W. J. Yuan ◽  
Q. Y. Zhu ◽  
C. J. Deng ◽  
H. X. Zhu
Keyword(s):  
Magnesia Refractory ◽  
Refractory Castables ◽  
In Situ Reactions

scholarly journals In-situ reactions and mechanical properties of 6061 aluminum alloy weld joint with SiCp by laser melting injection

2021 ◽  
Vol 203 ◽  
pp. 109538
Author(s):  
Boan Xu ◽  
Ping Jiang ◽  
Shaoning Geng ◽  
Yilin Wang ◽  
Jintian Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Weld Joint ◽  
Laser Melting ◽  
6061 Aluminum Alloy ◽  
In Situ Reactions ◽  
Alloy Weld

scholarly journals Effect of In-Situ Synthesized Boride Phases on the Impact Behavior of Iron-Based Composites Reinforced by B4C Particles

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 554
Author(s):  
Fehmi Nair ◽  
Mustafa Hamamcı
Keyword(s):  
Contact Forces ◽  
Impact Behavior ◽  
Iron Matrix ◽  
Impact Tests ◽  
B4c Particles ◽  
Iron Based ◽  
In Situ Reactions ◽  
Boride Phases ◽  
The Impact

The objective of this study is to investigate the impact behavior of iron-based composites reinforced with boron carbide (B4C) particles and in-situ synthesized iron borides (Fe2B/FeB). The composite specimens (Fe/B4C) were fabricated by hot-pressing under a pressure of 250 MPa at 500 °C, and sintered at a temperature of 1000 °C. The effects of the reinforcement ratio on the formation of in-situ borides and impact behavior were investigated by means of different volume fractions of B4C inside the iron matrix: 0% (un-reinforced), 5%, 10%, 20%, and 30%. Drop-weight impact tests were performed by an instrumented Charpy impactor on reinforced and un-reinforced test specimens. The results of the impact tests were supported with microstructural and fractographical analysis. As a result of in-situ reactions between the Fe matrix and B4C particles, Fe2B phases were formed in the iron matrix. The iron borides, formed in the iron matrix during sintering, heavily affected the hardness and the morphology of the fractured surface. Due to the high amount of B4C (over 10%), porosity played a major role in decreasing the contact forces and fracture energy. The results showed that the in-situ synthesized iron boride phases affect the impact properties of the Fe/B4C composites.

Thermal and morphological analysis of the interaction effect of different assist gases with gas-filled closed-cell aluminium foam during laser cutting process

2020 ◽  
pp. 095440542091725
Author(s):  
Mohammad Shahid Raza ◽  
Susmita Datta ◽  
Partha Saha
Keyword(s):  
Interaction Effect ◽  
Laser Cutting ◽  
Laser System ◽  
Aluminium Foam ◽  
Cutting Process ◽  
Fibre Laser ◽  
Closed Cell ◽  
Structural Applications ◽  
In Situ Reactions

Closed-cell aluminium foam, a porous structure, is effectively used for insulation, structural applications, packaging and filtering. Cutting of aluminium foam with the help of fibre laser is an efficient method due to the inherent advantages of fibre laser. Laser cutting of aluminium foam was carried out using a 2-kW fibre laser system for varying process parameters and different assist gas environments. Use of different foaming agents results in the generation of gas-filled pores. During the laser cutting process, the interaction of these gas-filled pores with assist gas results in in-situ reactions, generating different kerf quality. This interaction effect of foam cutting was reported using optical, metallurgical and thermal analysis. Thermal cycles were recorded to understand the occurrence of different in-situ reactions. From the temperature signal for different assist gases, oxygen showed the highest temperature, followed by nitrogen and argon. Argon assist gas gave minimum kerf width, while nitrogen assist gas produced minimum dross. Elemental and phase analysis showed the presence of new compounds and intermetallics in the cut section that stipulated the occurrence of in-situ reactions during the cutting process. The internal pore surface showed the presence of spatter in case of oxygen, while nitrogen and argon gas environment showed relatively less pore-clogging.

Pressureless Melt Infiltrated Non-Oxide Ceramic-Metal Composites

2008 ◽  
Vol 403 ◽  
pp. 251-252
Author(s):  
A. Kalemtas ◽  
Gürsoy Arslan ◽  
Ferhat Kara
Keyword(s):  
Oxide Ceramic ◽  
Light Weight ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
Metal Composites ◽  
X Ray ◽  
Melt Infiltration ◽  
In Situ Reactions ◽  
B4c Powder

In the present study highly dense (open porosity < 1 %), light-weight (d £ 2.85 g/cm3) and Al4C3-free non-oxide ceramic-metal composites were produced at comparatively low temperatures ( 1250°C) by pressurless melt infiltration. Phase analysis of the SiC-B4C-Al composites revealed that a significant amount of hygroscopic Al4SiC4 and Al4C3 phases were formed. Si3N4 powder was added in different amounts to the SiC-B4C powder batches to suppress formation of these phases via in-situ reactions during the infiltration process. X-ray diffraction results of the SiC-B4C-Si3N4-Al composites confirmed that the incorporation of Si3N4 to the SiC-B4C system reduced or eliminated the formation of the hygroscopic phases and resulted in in-situ formation of AlN, SiC and Si phases in the composite.

A mild and efficient method for the reduction of oximes to imines for futher in situ reactions

1984 ◽  
pp. 337 ◽  
Author(s):  
Derek H. R. Barton ◽  
William B. Motherwell ◽  
Ethan S. Simon ◽  
Samir Z. Zard
Keyword(s):  
Efficient Method ◽  
In Situ Reactions
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