Article
Environmental Sciences
Deniz Akbay, Gokhan Ekincioglu
Summary: This study determined the hardness values of 12 different carbonated rocks using three different methods and analyzed the relationships between these hardness values and four different brittleness values. It was found that rebound-based hardness tests could be used to predict two of the brittleness values, but not the other two. The Leeb hardness test method was identified as the most accurate in estimating the brittleness indexes of rocks.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Construction & Building Technology
Kerstin Elert, Pedro Bel-Anzue, Miguel Burgos-Ruiz
Summary: The composition, structure, and reactivity of gypsum are closely related to its calcination temperature. However, there is a lack of systematic studies relating these characteristics to the mechanical properties and weathering resistance of plasters. In this study, the hydration behavior of gypsum calcined at different temperatures was examined, and the underlying mechanisms affecting plaster performance were identified. These findings enhance the understanding of traditional gypsum plaster performance and offer opportunities for developing sustainable building materials.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Chin-Shih Hsu, Stephanie L. Haag, Matthew T. Bernards, Qizhen Li
Summary: This study evaluates the impact of substituted chloride levels in hydroxyapatite (ClHAP) on surface and mechanical properties, and osteoblastic response. Highly densified 2-10% ClHAP bioceramics with outstanding surface hardness and compressive strength were found to be optimal for implantation due to their superior biocompatibility and potential for long-term osseointegration.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Virat Khanna, Vanish Kumar, Suneev Anil Bansal, Chander Prakash, Mohd Ubaidullah, Shoyebmohamad F. Shaikh, Alokesh Pramanik, Animesh Basak, S. Shankar
Summary: This study aimed to develop an Al-GNP composite to improve its mechanical properties. A series of Al-GNP composites were fabricated by varying the levels of GNPs, and the best enhancement in mechanical properties was achieved with 0.5 wt% GNP doping.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Luis Umbelino dos Santos, Kaio Niitsu Campo, Rubens Caram, Eder Socrates Najar Lopes
Summary: In this study, the influence of oxygen content on the microstructure and mechanical properties of Ti-Nb alloys was evaluated. The results showed that increasing oxygen content slightly affected the thickness of alpha plates and beta-transus, but improved hardness and compressive yield stress. Solid-solution strengthening by Nb and oxygen, along with microstructural refinement by Nb addition, were responsible for these improvements.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Dentistry, Oral Surgery & Medicine
Won-Jun Lee, Ye-Hyeon Jo, Burak Yilmaz, Hyung-In Yoon
Summary: This study investigated the effects of layer thickness, build angle, and viscosity on the mechanical properties and trueness of denture base resins used for digital light processing (DLP). It found that using low-viscosity resin, a layer thickness of 50 μm, and a build angle of 45 degrees resulted in denture bases with higher hardness and trueness.
JOURNAL OF DENTISTRY
(2023)
Article
Environmental Sciences
Fei Zhao, Qiang Sun, Zhenlong Ge, Chen Dang
Summary: The purpose of this study is to investigate the changes in engineering mechanical properties of granite after various heating/cooling treatments, and to reveal the damage mechanisms. The results show that the strength of granite can be evaluated by the hardness index, which is of great engineering significance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Paper & Wood
Bruno Esteves, Sirri Sahin, Umit Ayata, Idalina Domingos, Jose Ferreira, Levent Gurleyen
Summary: Hardness is an important property of wood for various applications. Heat treatment was found to decrease the hardness of wood, with the magnitude of decrease depending on treatment time and temperature, and varying among different wood species. Additionally, analysis of variance tests revealed significant effects of wood species, heat treatment, and the interaction between both variables on wood hardness.
Article
Polymer Science
Francesco De Angelis, Mirco Vadini, Matteo Buonvivere, Antonio Valerio, Michele Di Cosola, Adriano Piattelli, Virginia Biferi, Camillo D'Arcangelo
Summary: Recent studies show that graphene incorporation in dental materials improves their mechanical properties but may not be superior to traditional materials in terms of hardness and mechanical response to compressive stress. In this study, the flexural strength, compressive strength, and hardness of a graphene-reinforced resin, a conventional resin, and a bis-acryl composite resin were compared. Flexural strength did not differ significantly among the materials. However, the conventional resin had a higher flexural modulus and stiffness compared to the graphene-reinforced resin. The hardness of the conventional resin was significantly higher than that of the graphene-reinforced resin and the traditional resin.
Article
Construction & Building Technology
Jun Ren, Xianfeng Wang, Shengye Xu, Qiling Luo, Yunhui Fang, Jihua Zhu, Feng Xing
Summary: This study systematically investigated the effects of two typical superplasticisers on the hydrated characteristics and hardened properties of seawater-blended cement, revealing that the incorporation of superplasticisers slightly increases water film thickness, seawater enhances hydration heat and densifies microstructures, and compressive strength decreases due to the increase in capillary pores induced by superplasticisers.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Yaoping Lu, Deyi Qu, Yonghua Duan, Mingjun Peng
Summary: A new route utilizing prefabricated TiB whiskers was explored to prepare a hardness gradient layer on pure titanium, leading to the successful fabrication of a gradient layer with varying hardness components on the surface. The gradual decrease in hardness from the surface to the matrix improves the protective effect of the surface layer on the matrix and enhances the service stability of titanium and its alloys.
CERAMICS INTERNATIONAL
(2021)
Article
Automation & Control Systems
Sathish Thanikodi, Devi Veera Venkata Satya Bhimeswar Reddy Saragada, Marasandra Eswarachari Shashi Kumar, Patan Saleem Akram, Saravanan Rathinasamy, Asiful Hossain Seikh, Abhishek Ghosh
Summary: The study focuses on the fabrication of a nanocomposite material with improved hardness and compressive strength by incorporating fly ash nanopowder and carbon nanotube (CNT) reinforcement into an iron matrix via the sintering process. Parameter optimization using the Taguchi technique with an L36 orthogonal array was conducted, and the optimized factors for maximum hardness and compressive strength were determined to be 2.5% fly ash volume percentage and 5% 50 nm size CNT volume percentage. Composite samples were produced using the identified optimal parameters, and a mathematical model was developed to predict the hardness and compressive strength of various combinations of factors. The models exhibited good agreement with the experimental results, as indicated by an R-2 value greater than 95%.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Chemical
Elisa Mercadelli, Angela Gondolini, Matteo Ardit, Giuseppe Cruciani, Cesare Melandri, Sonia Escolastico, Jose M. Serra, Alessandra Sanson
Summary: This study investigated the hydrogen permeation of BCZY-GDC asymmetric membranes for 100 hours using wet 15% CO2 in Ar as the sweep gas. The results showed that the asymmetric membranes exhibited promising and stable hydrogen permeation flux values under the test conditions, and no structural or morphological changes were detected after the testing.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Mohammed A. Taha, M. F. Zawrah, H. M. Abomostafa
Summary: In this study, sintered Al/Al2O3 hybrid composites reinforced with varying amounts of SiC and graphene were prepared using aluminum dross waste. The effects of reinforcement content and sintering temperature on the properties of the composites were investigated. The results showed improvements in physical, mechanical, and electrical properties with increasing SiC and graphene content as well as sintering temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Construction & Building Technology
Kerstin Elert, Ruben Alabarce Alaminos, Cristina Benavides-Reyes, Miguel Burgos-Ruiz
Summary: Despite the extensive use of gypsum-lime plasters and renders worldwide, there is a lack of systematic studies on the effect of lime content on their properties. Our study found that even small lime additions reduced strength but compatible conservation materials can be designed. Lime additions also significantly improved weathering resistance, enabling wider use of gypsum-lime plasters as a more sustainable alternative to current building materials.
CEMENT & CONCRETE COMPOSITES
(2023)