The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

Ali, Mohammed; Hanim, M.A. Azmah; Tahir, Suraya Mohd; Jaafar, Che Nor Aiza; Mazlan, Norkhairunnisa; Матори, Хамирул Амин

doi:10.1155/2017/2586026

Cited by 18 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Square inserts of 12 mm × 12 mm × 4.76 mm made from oxide ceramics strengthened with silicon carbides were used for the conducted experiments. This kind of ceramic has a composite structure which was achieved by adding ceramic powdered SiC to the main powdered Al 2 O 3 in the form of whiskers [25][26][27][28][29][30][31][32]. The whiskers provide higher strength characteristics during sintering.…”

Section: Cutting Tools and Materials Being Processedmentioning

confidence: 99%

The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

et al. 2018

View full text Add to dashboard Cite

The main problem with ceramics used in cutting tools is related to the unpredictable failures caused by the brittle fracturing of ceramic inserts, which is critical for the intermittent milling of cyclic loading. A 125-mm-diameter eight-toothed end mill, with a mechanical fastening of ceramic inserts, was used as a cutting tool for milling hardened steel (102Cr6). For the experiments, square inserts of the Al2O3 + SiC ceramic were used and compared with the samples made of Al2O3 + TiC to confirm the obtained results. The samples were coated with diamond-like coating (DLC), TiZrN, and TiCrAlN coatings, and their bending strength and adhesion were investigated. Investigations into the friction coefficient of the samples and operational tests were also carried out. The effect of smoothing the microroughness and surface defects in comparison with uncoated inserts, which are characteristic of the abrasive processing of ceramics, was investigated and analyzed. The process developed by the authors of the coating process allows for the cleaning and activation of the surface of ceramic inserts using high-energy gas atoms. The impact of these particles on the cutting edge of the insert ensures its sharpening and reduces the radius of curvature of its cutting edges.

show abstract

Section: Cutting Tools and Materials Being Processedmentioning

confidence: 99%

The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The incorporation of 10–15 wt% RHA as a partial replacement for cement enhances the strength and durability properties of self‐compacting cement (SCC). Ali et al 178. reported that 10–50 wt% of RHA added with alumina creates more porosity and new phases like cristobalite and corundum (an Al 2 O 3 ‐related phase), which increase the tensile strength and compressive strength of the concrete.…”

Section: Second Generation Agricultural Wastes and Their Usesmentioning

confidence: 99%

Biomass as a sustainable resource for value‐added modern materials: a review

Sharma

Kaur

Punj

et al. 2020

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

Over the past century, the world's population has increased greatly. The growth in the population has increased the global food demand, so the food sector has increased its production. As a result of the increased production and consumption, a huge amount of agro-food waste is being generated yearly. Rice husk, wheat straw, sugarcane bagasse, corn husk, peanut shell, eggshell, are just a few examples of agro-food wastes. As these agro-food wastes and their by-products are left unused and unattended, their amount is increasing globally. It is imperative to find ways to put these wastes to environmentally viable use. These wastes find direct uses in biofertilizers, mud houses, animal feed, biofuel, and heat generation in small-scale industries, etc. After heat generation, ashes are considered as a secondary by-product, which can be used as a sustainable and renewable resource for synthesizing value-added products for various applications. This article presents a review of the traditional and advanced methods of utilizing these wastes in household applications, animal feed, fertilizers, fuel generation, pyrolysis, and for the removal of toxic metals from polluted water. These secondary resources can also be used in construction materials and for the synthesis of glasses and glass-ceramics, which can be used in bioengineering, optical, and dielectric materials. Agrofood wastes can be used as resource materials to develop modern materials with better properties instead of using minerals. This not only reduces the environment-and management-related problem of the wastes but also provides a sustainable alternative way to produce cost-effective value-added materials for the benefit of society.

show abstract

“…The UPV test was performed to obtain preliminary information on the internal structure or the compressive strength of the materials. It is the non-destructive test method, which is used to assess the quality of the solid materials [25]. In addition, the UPV values vary depending on both density and compositions of the materials.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 99%

Development of a cementless eco-binder as an alternative to traditional Portland cement in construction activities

Phuoc

Hùng

Tuấn

et al. 2020

STCE

View full text Add to dashboard Cite

In this research, the performance of a cementless eco-binder, a mixture of waste materials including slag, circulating fluidized bed combustion ash (CFA), and rice husk ash (RHA) was investigated, in which CFA acted as an activator. One hundred and twenty paste samples were prepared by using the RHA/(slag + RHA) ratios of 0, 15, 30, 45% while keeping a constant ratio of CFA/(slag + RHA) at 25%. The setting period, compressive strength, the ultrasonic pulse velocity (UPV), and drying shrinkage of paste samples were determined at the samples’ age of up to 91 days. In addition, the microstructures of all paste samples were also characterized by scanning electron microscopy (SEM). It was found that the use of cementless eco-binder significantly increased the setting times, lower compressive strength, drying shrinkage, and UPV values compared to the control OPC sample. The maximum 91-day-old compressive strength gained by the binary binder of slag and CFA (R00C25) was 90% of that of the control specimen. Incorporation of RHA with higher replacement levels up to 45% resulted in a significant decrease in compressive strength up to 50%. Moreover, the SEM analysis revealed that there was a large difference in the microstructures of the control and the cementless eco-binder samples, in which the main hydration products were C-S-H/C-A-S-H gels and ettringite (AFt) due to relatively high amount of SO3 and SiO2 in the CFA and RHA, respectively. Thus, it can be realized that the potential for the use of slag, CFA, and RHA as a sustainable cement-free binder is promising in the construction industry, especially for lower strength or no required early high strength structures. Keywords: cementless eco-binder; circulating fluidized bed combustion; rice husk ash; slag; microstructure; compressive strength; drying shrinkage; setting time; ultrasonic pulse velocity.

show abstract

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

Cited by 18 publications

References 41 publications

The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

Biomass as a sustainable resource for value‐added modern materials: a review

Development of a cementless eco-binder as an alternative to traditional Portland cement in construction activities

Contact Info

Product

Resources

About