Пясък от силициев карбид

Silicon carbide is an extremely hard, synthetically produced crystalline compound of silicon and carbon. Both friable (green) and regular (black) varieties of this material can be produced through heating silica sand with carbon, typically petroleum coke, in an open furnace called an “Acheson”.

Razor-sharp grains make this tool suitable for easily sanding glass, plastic and medium-density fiberboard with minimal pressure; however, harder materials like metal or wood may need additional work to achieve complete cutting action. Furthermore, its razor-sharp grains can also be used to polish automotive parts, remove rust from wood floors refinish them as well as deburr metal surfaces.

Твърдост

Silicon carbide (SiC) is an extremely hard abrasive material, scoring 9 on the Mohs scale. To create it, silica sand, petroleum coke and other materials are combined and heated in a resistance furnace to form SiC powder that can then be used in various applications including abrasive blasting.

Silicon carbide blasting sand boasts sharp, hard abrasive grains which help it slice through glass, plastics, medium density fiberboard and metals with only light pressure. Unfortunately, its brittle grits wear away quicker than aluminum oxide abrasives on harder surfaces due to narrower edges which cause wear more quickly requiring frequent replacement than other blasting media.

Rock-based and fused-silica silicon carbide sands come in various grain sizes to meet different applications, and both types boast high abrasion and thermal shock resistance as well as strength, fracture toughness, and thermal expansion coefficient values. Rock-based silicon carbide sand is usually the more cost-effective choice when it comes to blasting projects; cutting and grinding applications may also utilize this material.

Fused-silica silicon carbide sand boasts greater strength than rock-based abrasive, while being less flexible. Additionally, it boasts lower fracture toughness and thermal shock resistance compared to fused alumina sand, making it more suitable for more demanding abrasion applications such as waterjet cutting and fine grinding.

Silicon carbide grits are harder and sharper than aluminum oxide ones, making it suitable for hard surfaces like glass, marble, metal, stone, fiberglass and some plastics. Furthermore, silicon carbide works well etching soft materials in preparation for finishing coats application; it may also etch soft materials for finishing applications like finishing coats. Unfortunately though, silicon carbide does not do well on steel or stainless steel metals whereas aluminum oxide does – making it the more desirable abrasive choice in most blasting applications!

Brittleness

Silicon carbide is a brittle material with narrow, hard and sharp grains that makes it less durable compared to aluminum oxide; thus it will break down and wear away more rapidly than its aluminum oxide counterpart. Due to this reason, silicon carbide often works alongside aluminum oxide on various sandblasting jobs as part of an alternative pair-up; such as rough sanding with aluminum before switching over to silicon carbide for finishing stages of projects.

Silicon carbide ranks third on the Mohs hardness scale, behind diamond and boron carbide. Due to this property, silicon carbide makes an attractive component in grinding wheels and other abrasive products; additionally it works well in high temperature environments due to its resistance against chemical reactions, low coefficient of thermal expansion and strong strength properties.

Silicon carbide comes in two primary polymorphs: alpha and beta. Alpha silicon carbide forms at temperatures above 1700degC with a hexagonal crystal structure similar to that of wurtzite; while beta forms at lower temperatures with zinc blende crystal structure. Both forms of silicon carbide have numerous applications; however beta tends to be used more due to its soft properties.

Green silicon carbide is created by heating silica sand with carbon sources like petroleum coke at high temperatures in a resistance furnace. This creates crystalline grains with both green and black colors; with black being caused by impurities while green has higher purity ratings.

Sanding veneers and dense hardwoods is just one of many projects where this abrasive proves itself effective, providing a smooth surface to various wood types. Furthermore, its use brings out their true beauty, revealing refined and polished workpieces alike.

Silicon carbide sand should not be used on all metals, especially soft ones such as cast iron or steel, though some hard metals like stainless steel might work. Furthermore, silicon carbide sand makes for an excellent way to sand fiberglass, ceramics and composites – as it’s available both wet and dry in various grit sizes.

Abrasive properties

Silicon carbide sandpaper reigns as one of the premier abrasives available, boasting exceptional hardness and heat resistance. Perfect for revitalizing wooden furniture or priming surfaces for paint application, silicon carbide sandpaper should always be included as part of your arsenal.

Silicon carbide abrasives differ from other abrasives in that they don’t become dull with wear, helping maintain consistent surface finishes for longer. Their unique grit structure features sharp cutting edges and rounded segments which helps break down material faster and cut deeper without overheating – making this investment cost-efficient for all your sanding needs.

Silicon carbide sand’s abrasive properties stem from its chemical makeup, which contains high concentrations of silicon. As such, this raw material is valued by industries in metallurgy, refractories, and abrasives; grinding wheels, paper abrasives and cloth can all benefit from silicon carbide’s low thermal expansion coefficient and strong acid attacks can withstand harsh environments more readily than most others.

Silicon Carbide (SiC) is produced through an Acheson furnace process using silica sand and carbon sources such as petroleum coke, with Green and Black coloring depending on purity levels. Once cooled, SiC undergoes a grading and classification process which breaks it into different grit sizes to be used in abrasives.

Silicon carbide sand is widely used as part of coated abrasives for wood sanding applications, including wood finishing or coating processes. Its course grits make it effective at prepping wooden materials for final touches before finishing or coating; its antirust qualities also allow it to remove rust from metals; remove debris from stone surfaces before shaping, as well as its abrasive qualities making it suitable for etching glass while artists create patterns on other materials with it. Compared to aluminum oxide, silicon carbide sand provides more durable results and uniform results more consistently throughout compared with its competitors such as aluminum oxide; its durability offers more consistent finishes overall.

Приложения

Silicon carbide sand has many uses in woodworking. It works especially well to smooth rough surfaces, remove rust and prepare wood for staining or painting, while it is also often used to deburr metal and sand glass edges. While more brittle than aluminum oxide abrasives, silicon carbide sand can still help polish metal components and parts by polishing their surfaces.

Due to its hard and sharp properties, silicon carbide abrasives make an ideal solution for cutting hard materials such as stone, metal, cork, glass and plastic with light pressure compared to aluminum oxide abrasives – though their razor-sharp grains may microfracture more frequently.

Aluminium has long been utilized as an element of semiconductor devices, including bare dies, discrete Schottky diodes and power MOSFETs. Due to its superior resistance against high voltages compared to other semiconductor materials, aluminium finds particular use in electric vehicle battery inverters and sensor systems.

Green silicon carbide can be produced by heating silica sand (SiO2) with carbon sources such as petroleum coke in an Acheson furnace at high temperatures, producing either black or green colored crystals depending on its purity.

Black and green silicon carbide abrasives are often employed in grinding wheels for hard and brittle materials like titanium alloys, marble and tungsten carbide alloys. Furthermore, this material has the capability of grinding nonferrous metals such as ceramics. Due to its higher hardness than tungsten carbide it makes this ideal for grinding steel as well as other hard materials – even suitable for use on car brakes and bulletproof vest ceramic plates!

Silicon carbide exists naturally as the rare mineral moissanite and has been mass produced since 1893 as an abrasive and other industrial applications. Large single crystals may also be grown through Lely method for gem cutting applications – this form of silicon carbide is often known as carborundum.