scholarly journals Microstructure, Microhardness, Fracture Toughness, and Abrasive Wear of In-Situ Synthesized TiC/Ti-Al Composite Coatings by Cold Spraying Combined with Heat Treatment

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1034 ◽  
Author(s):  
Xiao Chen ◽  
Chengdi Li ◽  
Xiaobo Bai ◽  
Hao Liu ◽  
Shunjian Xu ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Intermetallic Compounds ◽  
Composite Coatings ◽  
Cold Spraying ◽  
Xrd Analysis ◽  
Gas Temperature ◽  
Al Composite ◽  
Average Porosity ◽  
Annealed Coating

TiAl intermetallic compounds, as a new kind of high-performance light-weight structural material, are widely applied in many fields. Titanium carbide (TiC) as the reinforcing phase could improve the mechanical properties, wear resistance, and heat-resistance stability of TiAl intermetallic compounds. Ti(Al, C) mixture powders were deposited by cold spraying at gas temperature of 250 °C, 450 °C, and 550 °C. Then, Ti(Al, C) coatings were annealed at temperatures of 650 °C for different times and following holding at 1100 °C for 3 h. The microstructure, microhardness, fracture toughness, and abrasive wear of Ti-Al composite coatings were investigated. The research results were that the particle size of mixture powders decreased as the ball milling time prolonging. Ti(Al) solid solution appeared in the mixture powders as the milling time increased to 30 h. The average porosity of the coating sprayed at 550 °C was the lowest (0.85%). The as-sprayed coatings exhibited the same phase compositions with the mixture powders. The coating sprayed at gas temperature of 550 °C has the highest microhardness and the lowest weight loss. Ti-Al intermetallic was in-situ synthesized after annealing at 650 °C. The average porosity of the annealed coating (sprayed at 450 °C) was the lowest. The content of Ti-Al intermetallic compounds of the annealed coating sprayed at 450 °C is the highest. The X-ray diffraction (XRD) analysis results are consistent with the EDS analysis of the annealed coatings after annealing at 650 °C. Ti-Al intermetallic compounds were almost completely formed in the three kinds of the coatings after annealing at 650 °C for 20 h and following holding at 1100 °C for 3 h. TiAl and TiAl3 intermetallic phases were in-situ synthesized in the coatings based on the energy dispersive spectroscopy (EDS) and XRD analysis. TiC was also in situ synthesized in the coatings as the annealing temperature increased to 1100 °C. The annealed coating (sprayed at 450 °C) has the highest microhardness, fracture toughness, and wear resistance properties after annealing at 1100 °C for 3 h.

scholarly journals Microstructure and Microhardness of Ni/Al-TiB2 Composite Coatings Prepared by Cold Spraying Combined with Postannealing Treatment

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 565 ◽  
Author(s):  
Xiao Chen ◽  
Chengdi Li ◽  
Shunjian Xu ◽  
Yao Hu ◽  
Gangchang Ji ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Composite Coatings ◽  
Cold Spraying ◽  
Tib2 Particle ◽  
Gas Temperature ◽  
Composite Powders ◽  
Average Porosity ◽  
Sprayed Coating ◽  
Tib2 Particles ◽  
Sprayed Coatings

Ni/Al-TiB2 composite powders were deposited on the surface of 316L stainless-steel substrates by cold spraying at gas temperatures of 250 and 450 °C, respectively. Then, the as-sprayed coatings were annealed at 650 °C for 10, 20, and 30 h. The experimental results showed that the average porosity of as-sprayed coating dropped from about 0.68% to 0.054% as the cold spraying gas temperature increased. The contents of Ni, Al, and TiB2 in the as-sprayed coatings were different from that of the Ni/Al-TiB2 composite powders. The main phase compositions of the as-sprayed Ni/Al-TiB2 coatings were the same as those of composite powder, consisting only of pure Ni, Al, and TiB2 phases. TiB2 as a reinforced particle in the as-sprayed coating could obviously increase the microhardness of the coatings. NiAl3 and Ni2Al3 intermetallic compounds were synthesized in situ in all of the annealed coatings, and the average contents of NiAl3 and Ni2Al3 intermetallic compounds increased as the cold spraying gas temperature increased. The distribution of TiB2 particle was changed as the annealing times increased, which changed from more comparative uniform distribution to accumulation. The average porosity of the annealed coatings increased as the annealing time increased. The microhardness of Ni/Al-TiB2 coatings annealed at 650 °C for 10 h was increased remarkably due to the reinforcement role of TiB2 particles and NiAl3 and Ni2Al3 intermetallic compounds.

Fracture toughness of in situ TiCp–AlNp/Al composite

2000 ◽  
Vol 100 (1-3) ◽  
pp. 36-41 ◽  
Author(s):  
Chunxiang Cui ◽  
Renjie Wu ◽  
Yanchun Li ◽  
Yutian Shen
Keyword(s):  
Fracture Toughness ◽  
Al Composite

scholarly journals New Paradigm On The Mechanical Properties of In-Situ Formed By Al/TiB2 and Al/TiB2/Cu MMCs

2022 ◽  
Author(s):  
Rajaravi C ◽  
Gobalakrishnan B ◽  
AMALA MITHIN MINTHER SINGH A ◽  
ARUL FRANCO P ◽  
SHARUN V
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Metal Matrix ◽  
Xrd Analysis ◽  
New Paradigm ◽  
Casting Method ◽  
Optical Micrograph ◽  
Tib2 Particles

Abstract In the current study, in-situ formed Al/6wt. % TiB2 and Al/6wt. % TiB2/4wt. % Cu Metal Matrix were investigated. Composites were made using the sir casting method, and both composites were compared. The composite is synthesized by combining two precursor salts, Potassium Hexa Fluro Titanate (KBF4) and potassium tetrafluoroborate (K2TiF6), with stoichiometric compositions corresponding to 6 percent by weight of TiB2 particles, with A356 aluminium melt at 820° C, speed 300 rpm, and holding time 30 minutes. Following that, 4wt. % Cu powder was added to the composite melt, which was then poured into the permanent mould. Mechanical properties tests such as tensile strength, hardness, and fracture toughness were carried out in accordance with ASTM guidelines. The mechanical properties of the in-situ formed Al/6wt. % TiB2/4wt. % Cu composite outperform those of the Al/6wt.% TiB2 composite and base metal. Optical micrograph and XRD analysis both confirm the presence of TiB2 and Cu particles.

Microstructure and Corrosion Resistance of In Situ Al0.983Cr0.017/Al Composites

2012 ◽  
Vol 535-537 ◽  
pp. 206-209
Author(s):  
Jian Zhang ◽  
Qiu Lin Wang ◽  
Bin Wan ◽  
Long Zhi Zhao
Keyword(s):  
Corrosion Resistance ◽  
Intermetallic Compounds ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Mechanical Stirring ◽  
Al Composite ◽  
The Matrix ◽  
Clean Interface

In situ Al0.983Cr0.017 intermetallic compounds reinforced aluminum matrix composite was fabricated by the mechanical stirring casting method in this paper. In addition, microstructure and corrosion resistance of composite was investigated by XRD and SEM. The results show that the Al0.983Cr0.017 intermetallic compounds reinforcement distribute in the matrix uniformly. The clean interface between reinforcement and matrix has good interfacial bond. The corrosion resistance of Al0.983Cr0.017/Al composite materials presented a U-shaped curve, the best corrosion resistance present in the composite with 12% volume fraction reinforcement. The Al0.983Cr0.017 has a high corrosion resistance, which promoted the nucleation of pitting. Furthermore, the reinforcement interrupt the continuity of the matrix, inhibits the further expansion of pitting, which increases the corrosion resistance of composites.

Microstructure and properties of in-situ composite coatings prepared by plasma spraying MoO3–Al composite powders

2021 ◽  
Vol 47 (1) ◽  
pp. 1109-1120
Author(s):  
Yan-wei Wang ◽  
Xing-yu Wang ◽  
Xiao-long Wang ◽  
Yong Yang ◽  
Yu-hang Cui ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Composite Coatings ◽  
Composite Powders ◽  
In Situ Composite ◽  
Microstructure And Properties ◽  
Al Composite

Effect of Si2N2O content on the microstructure, properties, and erosion of silicon nitride–Si2N2O in situ composites

2002 ◽  
Vol 17 (9) ◽  
pp. 2275-2280 ◽  
Author(s):  
Dong-Soo Park ◽  
Hyun-Ju Choi ◽  
Byung-Dong Han ◽  
Hai-Doo Kim ◽  
Dae-Soon Lim
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Hot Pressing ◽  
Xrd Analysis ◽  
Transgranular Fracture ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Pressing Powder

Silicon nitride–Si2N2O in situ composites were prepared by hot pressing powder mixtures of α–Si3N4, 6 wt% Y2O3, 1 wt% Al2O3, and 0–12 wt% SiO2. X-ray diffraction (XRD) analysis indicated that the volume percents of Si2N2O were 0, 13, 31, and 54 for the composites prepared with 0, 4, 8, and 12 wt% SiO2, respectively. XRD results also indicated that both silicon nitride grains and Si2N2O grains were laid down perpendicular to hot pressing direction. As the volume percent of Si2N2O increased, the width and the amount of elongated silicon nitride grains decreased, but the fracture toughness increased. Young's modulus of the in situ composites decreased as the Si2N2O content was increased. The erosion rate decreased as the Si2N2O content was increased, in part, due to both the increased fracture toughness and the reduced grain size. Erosion of the composites occurred primarily due to the grain dislodgment. The sample without Si2N2O experienced micro-chipping due to transgranular fracture.

Effect of Substrate Type on Deposition Behavior and Wear Performance of Ni-Coated Graphite/Al Composite Coatings Deposited by Cold Spraying

2017 ◽  
Vol 33 (4) ◽  
pp. 338-346 ◽  
Author(s):  
Chunjie Huang ◽  
Wenya Li ◽  
Yingchun Xie ◽  
Marie-Pierre Planche ◽  
Hanlin Liao ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Cold Spraying ◽  
Substrate Type ◽  
Wear Performance ◽  
Deposition Behavior ◽  
Al Composite

Microstructural Study of Copper and Copper/Alumina Composite Coatings Produced by Cold Spray Process

2010 ◽  
Vol 89-91 ◽  
pp. 556-561 ◽  
Author(s):  
Dimitris Pantelis ◽  
Kostoula Triantou ◽  
Charikleia Sarafoglou ◽  
Dimitris Christoulis ◽  
Francois Borit ◽  
...  
Keyword(s):  
Cross Sections ◽  
Composite Coatings ◽  
Cold Spraying ◽  
Xrd Analysis ◽  
Al2o3 Particle ◽  
Copper Particles ◽  
Spray Process ◽  
Coating Method ◽  
Alumina Composite ◽  
The Cross

Cold spraying is a novel coating method, by which many composites have been successfully sprayed. The objective of this study was to thoroughly characterize the microstructure of copper as well as copper/alumina composite coatings obtained using this technique. Composite coatings which differed to the percentage of Al2O3 in the initial powder blend as well as the Al2O3 particle size were studied. Coatings presented Ra of the order of 6-8 μm, with the copper coating having the highest value. Using optical microscopy the deformation of the copper particles of the cross sections was evident. Thickness ranged from 170 to 450 μm for the different coatings. The surfaces and the cross sections of the coatings were studied by means of scanning electron microscopy. Craters and Al2O3 particles that were embedded in the copper particles were observed. The XRD analysis of the powders and the respective coatings presented no differences.

Laser cladding Ni-base composite coatings reinforced by in-situ synthesized multiple carbide particles

2008 ◽  
Author(s):  
Ruiquan Kang ◽  
Mingxing Ma ◽  
Wenjin Liu ◽  
Minlin Zhong ◽  
Yide Kan ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Composite Coatings ◽  
Base Composite ◽  
Carbide Particles
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