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See all on WikipediaSuperhard material - Wikipedia
A superhard material is a material with a hardness value exceeding 40 gigapascals (GPa) when measured by the Vickers hardness test. They are virtually incompressible solids with high electron density and high bond covalency. As a result of their unique properties, these materials are of great interest in … See more
The hardness of a material is directly related to its incompressibility, elasticity and resistance to change in shape. A superhard material … See more
The structure of beta carbon nitride (β-C3N4) was first proposed by Amy Liu and Marvin Cohen in 1989. It is isostructural with Si3N4 and was predicted to be harder than diamond. The calculated bond length was 1.47 Å, 5% shorter than the C-C bond length in diamond. … See more
Unlike carbon-based systems, metal borides can be easily synthesized in large quantities under ambient conditions, an important technological advantage. Most metal borides are … See more
Diamond is an allotrope of carbon where the atoms are arranged in a modified version of face-centered cubic (fcc) structure known as "diamond cubic". It is known for its … See more
History
Cubic boron nitride or c-BN was first synthesized in 1957 by Robert H. Wentorf at General Electric, shortly after the synthesis of … See moreThe similar atomic sizes of boron, carbon and nitrogen, as well as the similar structures of carbon and boron nitride polymorphs, suggest that it might be possible to synthesize diamond-like phase containing all three elements. It is also possible to make … See more
Other hard boron-rich compounds include B4C and B6O. Amorphous a-B4C has a hardness of about 50 GPa, which is in the range of … See more
Wikipedia text under CC-BY-SA license Category:Superhard materials - Wikipedia
Pages in category "Superhard materials" The following 43 pages are in this category, out of 43 total. This list may not reflect recent changes.
Superhard Materials | What's Harder Than Diamond?
Sep 10, 2019 · Superhardness is determined if a material scores over 40 gigapascals, which are units meant to measure pressure. While there is some uncertainty in the calculations, scientists believe that...
Superhard material - Wikiwand
A superhard material is a material with a hardness value exceeding 40 gigapascals (GPa) when measured by the Vickers hardness test. They are virtually incompressible solids with high electron density and high bond …
Rhenium diboride - Wikipedia
Rhenium diboride is occasionally, and controversially, cited as a "superhard material" due to its high hardness level. However, tested in the asymptotic-hardness region, as recommended for hard and superhard materials, rhenium diboride demonstrates a Vickers hardness of only 30.1 ± 1.3 GPa at 4.9 N, well below the generally-accepted threshold of 40 GPa or more needed to classify it as "superhard". Another research has estimated the Hv of full-dense ReB2 at about 2…
Wikipedia · Text under CC-BY-SA license- Estimated Reading Time: 4 mins
Designing Superhard Materials | Science - AAAS
May 27, 2005 · To design new superhard materials, we must understand what makes diamond special. In diamond, tetrahedrally bonded sp 3 carbon atoms form a three-dimensional, covalent network of high symmetry. Other carbon …
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Superhard Materials - Scientific American
The hardness of a substance depends on the strength and orientation of the bonds between its atoms. The strongest symmetrical bonds are found in diamond and in the synthetic material …
Home | Journal of Superhard Materials - Springer
Journal of Superhard Materials is a peer-reviewed journal focusing on the production, properties, and applications of superhard materials and related tools. Publishes research on synthetic diamonds, carbide tools, and high-tech …
Predicting superhard materials via a machine learning informed …
Sep 3, 2019 · The a priori prediction of superhard materials is a global optimization problem that requires maximizing the computed hardness in the space of the low-lying local minima on the …
Hard, Superhard and Ultrahard Materials: An Overview
Jun 1, 2016 · This chapter gives general overview of hard, superhard and ultrahard materials, which include oxides, borides, nitrides and carbides of metals, cermets, carbon nitrides, cubic …
Recent Advances in Superhard Materials | Annual Reviews
Current research progress in novel superhard materials and nanostructuring approaches for high-performance superhard materials are discussed. We also clarify a long-standing controversy …
Cemented carbide - Wikipedia
Cemented carbides are a class of hard materials used extensively for cutting tools, as well as in other industrial applications. It consists of fine particles of carbide cemented into a composite …
Superhard Materials: Advances in the Search and Synthesis of …
Mar 26, 2021 · Materials with superior hardness can be categorized as ultrahard (Vickers hardness, Hv ≥ 80 GPa) and superhard (Hv ≥ 40 GPa). These materials are commonly used …
Hard and superhard materials: A computational perspective
Mar 1, 2019 · Hard and superhard materials are essential for a myriad of scientific, biomedical, and industrial applications. Their ability to resist indentation stems from the relationship …
Ultraincompressible, Superhard Materials - Annual Reviews
By studying the origin of strength from previously discovered incompressible, hard materials, we hope to gain new insight into this rapidly growing field. In particular, we propose a focus on …
Superhard Materials – Welcome to the kaner lab!
Designing Superhard Materials. Ten years ago, we (along with Professor Sarah Tolbert and her research group) suggested that new superhard materials could be compositionally designed …
Valery I. Levitas - Wikipedia
Valery I Levitas is a Ukrainian mechanics and material scientist, academic and author.He is an Anson Marston Distinguished Professor and Murray Harpole Chair in Engineering at Iowa …
Hard As Diamond? 43 New Forms of Superhard Carbon
Sep 9, 2019 · A study identifies dozens of new carbon structures that are expected to be superhard, including some that may be about as hard as diamonds. Superhard materials can …
Superhard material — Wikipedia Republished // WIKI 2
A superhard material is a material with a hardness value exceeding 40 gigapascals (GPa) when measured by the Vickers hardness test. They are virtually incompressible solids with high …
Discovery of superhard materials via CALYPSO methodology
Oct 1, 2019 · Exploring superhard materials is an important topic due to their scientific interest and potential application. Here, we present a short review of recent advances in the discovery of …
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