Iranian Journal of Materials Science and Engineering

• Optimal Composition for Sintering Density: The 88W-10Ni-2Mn alloy achieved the highest sintering density of 90.11%, despite chemical composition changes having minimal impact on sintering density overall.
• Impact of Carburization on Hardness: Carburization during sintering significantly increased micro-hardness, with the 90W-6Ni-4Mn alloy exhibiting the highest hardness of 381 Hv due to a low nickel-to-manganese ratio.
• Fracture Behavior Insights: The 90W-6Ni-4Mn alloy showed the most desirable trans-granular fracture mode, including cleavage and matrix tearing, highlighting the influence of the matrix phase and nickel-to-manganese ratio on crack propagation.

 

1.    Reported the synthesis and preparation method of thick films gas sensor of SnO2 added LaCrO3 films by simple and less expensive method
2.    The study on the impact of SnO2 additive on LaCrO3 perovskite revealed enhancements in various properties critical for gas sensing applications.
3.    Reported impact of SnO2 additive on electrical, structural and gas sensing properties of LaCrO3 perovskite thick films.
4.    SnO₂ doping altered the structural characteristics, improving crystallinity and surface morphology, which increased active surface area. 
5.    Optical studies indicated a modified bandgap, optimizing light absorption for sensing purposes. 
6.    Electrical measurements showed improved conductivity due to enhanced charge carrier mobility. 
7.    Gas sensing experiments demonstrated heightened sensitivity and selectivity, particularly for CH4 gas, making the doped material a promising candidate for environmental monitoring CH4 gas and industrial applications.
8.    Future perspectives of current research work is also provided by the authors. 


 

Highlights

 

• Basic surface functional groups on derived activated carbon are retained with main of carbonate after activation process.
• The methylene blue adsorption of derived activated carbon showed favorable the Langmuir isotherm with 96.36%-97.74% removal.
• The surface character of derived activated carbon showed large channel tube with 1.88-2.64 nm. average pore widths.
• Optimum treatment for tamarind derived activated carbon production is 3 wt.% NaCl and 600 W microwave power.
•  The activation with microwave-assisted NaCl for activated carbon production is feasible for commercial production.

 

Highlights

1. Ni-(Ti,W)C composite coating was electroplated on the AISI 304 stainless steel.
2. The results of SEM/EDS revealed the current density of 40 mA/cm² as the optimal value.
3. The findings from polarization tests revealed that the corrosion behavior of both the substrate and the coating was active-quasi passive.

•    Amber glass powder seems to be similar to that of dental ceramic in the morphology, structure, thermal behaviour, and non-hazard level of ion release.
•    Vickers hardness of the ceramic-amber material was enhanced in comparison to dental ceramic.
 





















Highlights of conclusion
•    Amber glass powder seems to be similar to that of dental ceramic in the morphology, structure, thermal behaviour, and non-hazard level of ion release.
•    Vickers hardness of the ceramic-amber material was enhanced in comparison to dental ceramic.
 



































 

Highlights:

·  A 3D orthogonal woven C/C-SiC-ZrB2 composite was fabricated using I-CVI, SI, and LSI.
·  The composite showed superior ablation resistance compared to C/C and C/C-SiC.
·  ZrB2 incorporation reduced ablation rates by forming a protective ZrO2 layer.
·  Residual Si melted at high temperatures, creating a protective SiO2 layer.
·  The ZrO2 layer blocked oxygen penetration and improved oxidation resistance.
 

• The highlight of the present study is to fabricate a dissimilar joints of AA2219 and Ti-6Al-4V alloys using the vacuum diffusion bonding method.
• To study the effect of the bonding pressure on the microstructure of the dissimilar metals like AA2219 and Ti-6Al-4V alloys joint
• The bonding pressure is controlled in the range of 1-4 MPa by keeping the bonding temperature and holding time constant.
• The influence of the bonding pressure on the microstructure and mechanical properties of the bonding joints is investigated.
• The diffusion behaviour across the interface of the bonding joints is increased with the increase in bonding pressure.
• The interface morphology of the specimen bonded at lower bonding pressures exhibits scraggly voids and cracks.
• The irregular voids and cracks are squeezed and gradually closed due to the significant increase in the diffusion between Al and Ti.
• The maximum shear strength of 81 MPa is obtained for the joint made at the bonding pressure of 4 MPa, and a diffusion layer of 0.76 µm is formed at the Ti side interface.
• The fracture morphology inferred the brittle failure of the bonding joints due to the formation of intermetallic compounds like TiAl, TiAl₂, and TiAl₃ at the interface of Al and Ti.

   
 

• PVA/CS composites exhibited coarser structure due to inconsistent CS dispersion.
• Composite film thickness increased with CS content.
• FTIR showed strong intermolecular interactions, hydrogen bonding in PVA/CS.
• Higher CS in PVA/CS films reduced tensile strength/strain, increased stiffness.

PVA/CS films showed effective antibacterial activity vs. Gram-positive B. subtilis

Highlights

• LBAM offers a transformative approach for fabricating complex NBSAs with superior properties.
• A complex interplay exists between LBAM process parameters, microstructure, defects, and the performance of NBSAs.
• LBAM can produce high-quality NBSAs, but challenges remain in mitigating defects like porosity and cracks.
• Addressing process control and defect mitigation is crucial for advancing LBAM technology.
• LBAM holds immense potential for producing high-performance NBSAs for various industrial applications.

 

Highlights

• Pure CdO_x and Cu-doped CdO thin films have been prepared by spray pyrolysis method.
• The Cu doping ratios correspond to 0, 0.46, and 1.51 at%.
• Cu contents in the as-deposited films lead to lessen the band gap values. In contrast, annealing process results in raising the band gap.
• Optical parameters such as, absorption, transmittance, dielectric constants etc. were comprehensively analyzed.

Highlights

• BZnO microrods synthesized (three-step synthesis method).
• XRD/ Rietveld refinement /Raman confirm hexagonal ZnO
• DFT matches experimental structure (structural properties)
• PL BZnO reveals more oxygen defects (enhanced photocatalytic activity)