The United States has found a "carbon" that is brighter than diamonds.

According to the Science and Technology Daily, scientists at the State University of New York at Stony Brook discovered three new carbon structures that can exist stably through simulation methods. These materials have a density that exceeds the density of the largest three-dimensional materials in the existing three-dimensional materials, with unique electronic and optical properties, such as successful synthesis, will become a breakthrough in the field of materials science.

Carbon is one of the most common elements on earth, but the different combinations and structures of its atoms create a variety of “skilled” allotropes: from soft graphite to superhard diamonds, with perfect structure. Fullerene to super material carbon nanotubes. Almost every modification of the carbon structure has led to a new technological revolution, and research related to carbon structure has been awarded two Nobel Prizes in 15 years (the study on fullerenes was awarded the Nobel Prize in Chemistry in 1996, Research on graphene was awarded the Nobel Prize in Physics in 2010).

To investigate whether there is a carbon structure that is denser than diamond, the researchers simulated the structure of the carbon atoms at different temperatures and pressures. Three stable structures were found, which were named hP3. tI12 and tP12. The simulation results show that although the hardness of these three structures does not exceed diamonds, their density is 1.1% to 3.2% higher than that of diamonds respectively, and higher density means better conductivity and better dispersion. Sex and refractive index, which will make it more dazzling than diamonds.  

Sanding Belt

Abrasive belt is a belt-shaped tool that can be ground and polished, which is made by bonding abrasives to flexible materials such as paper and cloth with a binder. It is a main form of coated abrasives. Its basic composition is: base material, abrasive and binder, collectively called the three elements of abrasive belt. Abrasive belt is the main tool of the sanding process. Abrasive belt grinding is a soft grinding method, which is a compound processing abrasive tool with multiple functions of grinding, grinding and polishing.

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Abrasive tools are tools for grinding, grinding and polishing. Most of the abrasives are artificial abrasives made of abrasives and bonding agents, and natural abrasives are also directly processed from natural ore. In addition to being widely used in machinery manufacturing and other metal processing industries, abrasive tools are also used in the processing of non-metallic materials such as food processing, paper industry and ceramics, glass, stone, plastic, rubber, and wood.

Abrasives are divided into natural abrasives and artificial abrasives. All materials that can be used for grinding or grinding in nature are collectively referred to as natural abrasives.

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Natural abrasives mainly include: natural corundum and garnet

Artificial abrasives mainly include: white corundum, brown corundum, silicon carbide, zirconium corundum, synthetic diamond, cubic boron nitride.

How to choose a suitable abrasive belt and further improve the smoothness and flatness of sanding is a very important issue in the use of abrasive belts. Due to the differences in the three major components of abrasive belts and various characteristic factors, abrasive belts can be divided into many varieties according to different grinding objects, grinding conditions and grinding requirements. The following is the classification of abrasive belts according to abrasives. Different abrasive belts are suitable for different products. The following types of belt operations are: automatic grinding, mechanical hand grinding, desktop grinding, and manual tool grinding.

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Types of abrasive belts (according to abrasives):

1: Accumulated abrasive belt

Application: Widely used in polishing various non-alloy, low-alloy and high-alloy steel, stainless steel, brass, bronze and other non-ferrous metals. Good self-sharpening, long service life, uniform grinding volume and uniform surface roughness.

2. Brown corundum belt

Application: Widely used in metallurgy, machinery, shipbuilding, wood, building materials, textile printing and dyeing industries. Grinding and polishing of bamboo and wood products, decorative panels, stainless steel, non-ferrous metals and other complex surfaces. Fast cutting, heat resistance, long service life, efficient wear resistance.

3. Ceramic abrasive belt

Application: Widely used in grinding chromium steel, chromium-nickel steel, stainless steel, high-alloy steel, nickel-based alloy, titanium alloy, brass and bronze, etc., with good self-sharpening, strong grinding, and large removal of grinding materials.

4. Silicon carbide belt

Application: Widely used in the grinding and polishing of brass, bronze, titanium alloy, aluminum alloy, glass, ceramics, minerals, stone, rubber, and synthetic materials. The sand surface is sharp, with very high strength and grinding ability, suitable for grinding medium and high density plates. The bucky has strong tension and ultra-wide sub-tension, which can be used for ultra-large abrasive belts.

5. Zirconium corundum abrasive belt

Application: Widely used in the grinding and polishing of steel, alloy steel, cast iron and non-ferrous metals, medium load or heavy load powerful grinding. The rigid polyester fabric is resistant to strong tension and impact, has high abrasion resistance, and has excellent comprehensive cost performance.


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