Groen siliciumcarbide voor oppervlaktebehandeling is gemaakt van petroleumcokes en hoogwaardig silica als de belangrijkste grondstof, zout toevoegen als additief, en gesmolten bij hoge temperatuur in een weerstandsoven. Het is groen kristallijn, broos en scherp, en heeft bepaalde thermische en elektrische geleidbaarheid. De microscopische vorm is hexagonaal kristal, de Mohs-hardheid van siliciumcarbide is: 9.4, microdichtheid hardheid is 2940-3300kg/mm2, Huwelijkshardheid 2670-2815kg/mm2, hoger dan korund in schuurmiddelen en de tweede alleen voor diamant, kubisch boornitride en boorcarbide. The density is generally considered to be 3.20-3.25g/cm3. The natural bulk density of silicon carbide abrasive is between 1.2–1.6g/cm3, and the specific gravity is 3.20~3.25g/cm3.

Groen siliciumcarbide micropoeder is selected from high quality large crystalline silicon carbide block by crushing, vertical ball mill particle shaping, acid washing moisture, hydraulic precision classification, natural settlement after high temperature drying, stable quality, good crystallization, high surface cleanliness, no large particles, less fines content, concentrated particle size distribution, high grinding efficiency, suitable for a variety of precision grinding processing, processing of the workpiece surface uniformity, no scratches.

Groene siliciumcarbide macrogrutten are the products of secondary shaping by Raymond mill, with less angular particles, good hydrophilicity, high grinding efficiency and long working life, enz.

Performance characteristics of green silicon carbide for surface treatment

Silicon carbide has high oxidation resistance

When heated to 1000 degrees Celsius in air, siliciumcarbide oxideert alleen aan het oppervlak, vorming van een siliciumdioxidefilm, die het siliciumcarbidemateriaal beschermt tegen oxidatie;.
When heated to 1300 graden Celsius, de siliciumdioxidefilmlaag begint vierkant kwarts neer te slaan, en de kristallijne transformatie zorgt ervoor dat de filmlaag barst en de oxidatiesnelheid iets toeneemt.

When heated to 1500-1600 graden Celsius, de silicafilmlaag wordt dikker en beschermt beter tegen oxidatie, waardoor het siliciumcarbide stabiel blijft bij hoge temperaturen. Het is alleen bij verwarming boven 1627 degrees Celsius that the antioxidant capacity of silicon carbide decreases rapidly.

Silicon carbide is more chemically stable.

The chemical stability of silicon carbide is also produced by its ability to resist oxidation.

The hardness of silicon carbide

The hardness of silicon carbide is between corundum and diamond, black silicon carbide Moh’s hardness is 9.2-9.3, green silicon carbide Moh’s hardness is 9.4-9.5, Vickers hardness is 3100-3400kg/mm2. silicon carbide hardness also decreases with the increase of temperature, in the high temperature state of 1200 graden, silicon carbide hardness can reach two times of corundum.

Toughness of silicon carbide

The toughness of silicon carbide abrasives refers to the degree of difficulty in breaking under the action of external forces, bijvoorbeeld, 46 gaas, the toughness of the static pressure method test is about 68-78%.

The mechanical strength of silicon carbide is higher than that of corundum, bijvoorbeeld, the compressive strength of silicon carbide is 186KN/cm2 and that of corundum abrasive is 100KN/cm2 at 120 maaswijdte.

Color of silicon carbide

Silicon carbide is divided into black silicon carbide and green silicon carbide. Its color is caused by the content and type of impurities present in the crystal. Black silicon carbide is light blue-black, and the purity of first-class black silicon carbide is 98%; green silicon carbide is green, and the purity of first-class green silicon carbide is 99%.

Thermal conductivity and linear expansion coefficient of silicon carbide

Thermal expansion coefficient of silicon carbide at different temperatures (x10-6/°C):

This shows that the average coefficient of thermal expansion of silicon carbide is 4.4×10-6/°C at 25-1400 graden Celsius, while that of corundum is 7-8×10-6/° C.

Electrical conductivity of silicon carbide

Due to the introduction of impurities , silicon carbide has the properties of a semiconductor. The electrical conductivity of silicon carbide increases rapidly with the increase in electric field strength and has a non-linear character. In aanvulling, the electrical conductivity of silicon carbide varies with temperature.

Chemische samenstelling

Fysieke eigenschappen

Application scenarios

1. Precision polishing of camera lens and other hard optical glass.
2. Sandblasting and open edge treatment of hard metal CNB tools such as titanium alloy and carbide.
3. Polishing and grinding quartz glass.
4. Grinding hard stone, marmer, granite, enz.
5. Polishing PZT/piezoelectric ceramics.
6. Sandblasting copper and copper alloy.
7. Surface treatment of diamond tools.
9. Polishing diamond, cinnabar and other jewelry.
10. Grinding other thin and brittle material precision parts.
11. Vuurvaste nieuwe nano-aerogel.
12. Gesinterd keramiek en andere vuurvaste isolatiematerialen.
13. Teflon-coating (teflon antiaanbaklaag toegevoegd), fluorkoolstof poedercoating. Slijtvast:, Roestvrij, hittebestendige rol;.
15. Luchtvaartvliegtuigremmen en andere hoogwaardige remadditieven.
16. Siliciumcarbide keramiek vuller.
17. Polijstgereedschappen zoals diamanten water schuursponsjes, PVC schuursponsjes, enz.
18. Slijtvast, corrosiebestendige en hittebestendige coating.