The Usability of Boric Acid as an Alternative Foaming Agent on the Fabrication of Al/Al2O3 Composite Foams

Yaman, Bilge; Onuklu, Eren; Körpe, Neşe Öztürk

doi:10.1007/s11665-017-2911-4

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…It is noteworthy that blowing agents have been used in the field of powder metallurgy, not only acting primarily when the material is in a semi-molten or molten state (as in PCMFP), but also in the solid state. For example, novel blowing agents such as boric acid were recently used during the 'sintering' (not melting) of aluminum and aluminum-alumina composites, resulting in porosity levels of 46-53%, when 50 wt.% boric acid was added [34]. Similar work also considered sintering using the same blowing agent with aluminum-fly ash particulate-aluminum composites [52], or aluminum-cubic boron nitride [53], while CaCO 3 was used as a blowing agent for copper foams [35].…”

Section: Common Blowing Agents Used In Pcmfpmentioning

confidence: 99%

“…For example, the PM route/powder foaming process [26,27], powder metallurgy process [28], powder compact process [29], powder compact route [30], powder compact melting technique [25], powder metallurgy foaming [31], the Fraunhofer process [32], and the powder compact melting process (PCMP) [17]. We, however, propose the name Powder Compact Melt Foaming Process (PCMFP), as this name more effectively captures the physics governing this process, whereas other names could also be applied to other processes or foams, e.g., for open-cell foams (the 'powder metallurgy route' was used to describe the processing of open-cell Mg foam [33]), or foaming using a blowing agent during solid state sintering [34,35] (not melting). Hence, from this point onwards, we will refer to the process as PCMFP.…”

Section: Introductionmentioning

confidence: 99%

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Review: Closed-Cell Metallic Foams Produced via Powder Metallurgy

Behymer,

Morsi

2023

Metals

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The production of closed-cell metallic foams has been of interest to the scientific community and industry for decades, owing to their unique properties, which include high specific strength and stiffness, buoyancy, shock absorption, and crash worthiness. One of the approaches for their fabrication relies solely on the use of powders and is manifested in what has been referred to as the powder metallurgy (PM) route. This review discusses the underlying fundamentals of the process, and recent developments together with our current understanding. The effect of process parameters on the developed foam structure is reviewed for a range of metals, alloys, and metal matrix composites. Fundamental foaming mechanisms and characteristics are discussed.

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Section: Common Blowing Agents Used In Pcmfpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review: Closed-Cell Metallic Foams Produced via Powder Metallurgy

Behymer,

Morsi

2023

Metals

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Effects of boron waste as a reinforcement in the production of Al composite foams

Kılıç

Körpe

2023

Materials Testing

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In this study, the effect of using boron products in the production of aluminium composite foam on the formation of pores and mechanical properties of the material was investigated. Metallic foam was produced by powder metallurgy method by adding borogypsum to the Al matrix and using boric acid (H3BO3) as a pore former. Samples containing 5, 10 and 20 wt% borogypsum were prepared at initial pressing pressures of 420 MPa and 630 MPa and sintered at 550 °C for 3 h. As a result of microhardness measurements taken from the cell wall of foam samples with ∼40% porosity, it was determined that the hardness value increased as the borogypsum ratio increased. According to the results of the quasi-static compression test performed at a deformation rate of 10−3 s−1 at room temperature, the hardness and strength values of 20 wt% borogypsum reinforced Al composite foam prepared at 630 MPa pressure increased. In addition, mechanical properties such as plateau tension and elastic modulus for each sample were theoretically determined with the Gibson–Ashby approach.

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Effect of Aluminum Casting Dross Addition on Mechanical Properties and Microstructure in Aluminum Foam Production

Uyan

Körpe

2022

ECJSE

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In the study, Al foams were produced using 6063 Al alloy casting dross and Boric acid. Foam materials were sintered at 130 ºC for 1 hour and at 550 ºC for 3 hours. The microstructure was analyzed with optical and scanning electron microscopes (SEM). Compression strength was measured with a compression tester. The porosity increased from 34.8% to 37.8%, the compressive strength increased from 12.43 MPa to 20.25 MPa, and the hardness increased from 98 HV to 115 HV with increasing dross amount.

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The Usability of Boric Acid as an Alternative Foaming Agent on the Fabrication of Al/Al2O3 Composite Foams

Cited by 3 publications

References 26 publications

Review: Closed-Cell Metallic Foams Produced via Powder Metallurgy

Review: Closed-Cell Metallic Foams Produced via Powder Metallurgy

Effects of boron waste as a reinforcement in the production of Al composite foams

Effect of Aluminum Casting Dross Addition on Mechanical Properties and Microstructure in Aluminum Foam Production

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