Toward Demystifying the Mohs Hardness Scale

Ballarini, Roberto; Hintsala, Eric; Mishra, Maneesh; Molinari, Jean‐François; Szlufarska, Izabela

doi:10.1111/jace.13753

Cited by 10 publications

(3 citation statements)

References 83 publications

(111 reference statements)

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“…Tile-and brick-shaped SunBG 90 substrates for water absorption and density (ASTM C140), abrasion resistance (ASTM C1353) [58,59], thermal conductivity (ISO 8302) [60,61], and Mohs hardness testing [62][63][64] were prepared by pouring the molten HSM into the appropriate silicone mold and allowing each substrate to solidify gradually at room temperature. Tiles of SunBG 90 for water absorption and density tests were obtained from molds with dimensions of 2 in × 2 in × 0.25 in (Figure 1).…”

Section: Synthesis and Fabricationmentioning

confidence: 99%

Thermal and Mechanical Properties of Recyclable Composites Prepared from Bio-Olefins and Industrial Waste

Sauceda-Oloño,

Borbon-Almada,

Gaxiola

et al. 2023

J. Compos. Sci.

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Ordinary Portland Cement (OPC) production consumes tremendous amounts of fresh water and energy and releases vast quantities of CO2 into the atmosphere. Not only would an alternative to OPC whose production requires no water, releases little CO2, and consumes less energy represent a transformative advance in the pursuit of industrial decarbonization, but the greater availability of safe drinking water would lead to significantly improved public health, particularly among vulnerable populations most at risk from contaminated water supply. For any OPC alternative to be adopted on any meaningful scale, however, its structural capabilities must meet or exceed those of OPC. An inverse vulcanization of brown grease, sunflower oil, and elemental sulfur (5:5:90 weight ratio) was successfully modified to afford the high-sulfur-content material SunBG90 in quantities > 1 kg, as was necessary for standardized ASTM and ISO testing. Water absorption (ASTM C140) and thermal conductivity (ISO 8302) values for SunBG90 (<1 wt% and 0.126 W·m−1·K−1, respectively) were 84% and 94% lower than those for OPC, respectively, suggesting that SunBG90 would be more resistant against freeze-thaw and thermal stress damage than OPC. Consequently, not only does SunBG90 represent a more environmentally friendly material than OPC, but its superior thermomechanical properties suggest that it could be a more environmentally robust material on its own merits, particularly for outdoor structural applications involving significant exposure to water and seasonal or day/night temperature swings.

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Section: Synthesis and Fabricationmentioning

confidence: 99%

Thermal and Mechanical Properties of Recyclable Composites Prepared from Bio-Olefins and Industrial Waste

Sauceda-Oloño,

Borbon-Almada,

Gaxiola

et al. 2023

J. Compos. Sci.

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“…Its new Mohs hardness is 13, with only diamond (15) and boron carbide (14) having greater hardness. [34] The SiC nanoparticles have a spherical shape and are used for sliding and abrasive members.…”

Section: Methodsmentioning

confidence: 99%

Friction and wear properties of polyacrylonitrile‐ and pitch‐based carbon fiber‐reinforced polymer matrix composites containing silicon carbide nanoparticles

2023

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This study investigated the friction and wear properties of high‐strength polyacrylonitrile (HS‐PAN)‐, high‐modulus polyacrylonitrile (HM‐PAN)‐, and high‐modulus pitch (HM‐pitch)‐based carbon fiber‐reinforced polymer matrix composites (CFRPs) with silicon carbide (SiC) nanoparticles. The fiber orientation of the CFRP specimens was set as 8‐ply unidirectional laminates, denoted as [0]8. Ball‐on‐disk (cyclic) wear testing was accompanied by laser, digital, and scanning electron microscope observations. For the HS‐PAN CFRP, the coefficient of friction and wear resistance were the highest among the HM‐PAN and HM‐pitch CFRPs and wear resistance was improved by the addition of SiC‐nanoparticles. Furthermore, there was no significant enhancement of wear resistance for the SiC‐nanoparticle‐filled and nanoparticle‐unfilled HM‐PAN CFRP. The wear resistance was improved by adding SiC‐nanoparticles for the HM‐pitch CFRP.

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“…The aim of this work is to demonstrate its ease of use and applicability to standard geologic materials as well as those whose elastic properties have been difficult to ascertain. Talc for example is considered one of the softest minerals as its hardness defines the lowest value on Mohs' Hardness scale (Gerberich et al, 2015;Mohs, 1925). However, this intrinsically weak behavior has resisted efforts to measure its true elastic properties, which have scarcely been reported on in the literature.…”

Section: Revisionmentioning

confidence: 99%

A new method to rapidly and accurately assess the mechanical properties of geologically relevant materials

Deng

Herrera

Prorok

2021

American Mineralogist

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A new indentation-based method was developed that will impact and facilitate the elastic property measurements of rocks and minerals, especially those possessing unusual deformation behavior including brittle materials and those with complex architectures. The novel feature employed is a metallic film that uniformly transfers the load from the indenter tip to the sample. The film also absorbs the damage caused by the penetrating indenter, shielding the material from highly localized deformation that can impact its response to loading. Many geologically relevant materials have resisted traditional indentation testing because they are either brittle in nature or possess highly anisotropic architectures, such as layered or lamellar structures. In both cases, the highly localized deformation from direct indentation significantly affects the indenter unloading stiffness, from which the elastic properties are determined. The indirect indentation method developed here, demonstrated accurate determination of the elastic properties of many common geologic materials as well as materials that have resisted elastic characterization such as galena and talc.

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Toward Demystifying the Mohs Hardness Scale

Cited by 10 publications

References 83 publications

Thermal and Mechanical Properties of Recyclable Composites Prepared from Bio-Olefins and Industrial Waste

Thermal and Mechanical Properties of Recyclable Composites Prepared from Bio-Olefins and Industrial Waste

Friction and wear properties of polyacrylonitrile‐ and pitch‐based carbon fiber‐reinforced polymer matrix composites containing silicon carbide nanoparticles

A new method to rapidly and accurately assess the mechanical properties of geologically relevant materials

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