Green SiC abrasive grain F30 F36 

Green silicon carbide grit is a very hard abrasive material . The hardness of it only ranks after diamond and B4C, and it is harder than black silicon carbide. So it is suitable to grinding large range of hard material such as titanium alloy, marble, carbide alloy, optical glasses, ceramics, etc.

Green Silicon Carbide is produced at high temperature in an electric resistance type furnace with quarts sand and petroleum coke. The SiC purity of green silicon carbide is up to 99%min. It is an artificial brittle SiC with high thermal conductivity and high strength which get no decrease in 1000 centigrade.

 

Typical physical properties of Green silicon carbide grit

Mohs Hardness:	9.5
Vickers Hardness:	3100-3400kg/mm2
Specific Gravity:	3.2g/cm3
Bulk density(LPD):	1.2-1.6 g/cm3
Color:	Green
Particle shape:	Hexagonal
Melting Point:	Dissociated at about 2600 centigrade
Maximum service temperature:	1900centigrade
Friability	Friable
Thermal conductivity	0.013 cal/cm2.sec (900°C)
Thermal expansion coefficient	7-9 x10-6 /℃(0-1600°C)

 

 

Chemical analysis of Green silicon carbide grit

TYPICAL CHEMICAL ANALYSIS
Chemical Content	F20-F220	F230-F2000
SiC	Min 99%	Min 98.5%
SiO2	Max 0.50%	Max 0.70%
F,Si	Max 0.20%	Max 0.40%
Fe2O3	Max 0.10%	Max 0.15%
F.C	Max 0.20%	Max 0.30%
L.O.I	Max 0.05%	Max 0.09%

 

Product Feature of Green silicon carbide grit

 

1. Extremely high hardness (Mohs 9.5, Vickers 3100-3400kg/mm2) with high wear-resistance ability. The hardness of SiC decrease with the increasing of temperature. But still, even at the temperature of 1200°C, the hardness of green SiC is about twice that of fused alumina’s.
2. Excellent chemical resistance and oxidation resistance. When heated at high temperatures, silicon carbide only oxidizes on the surface, forming a silicon dioxide film. The film can protect the silicon carbide material from oxidation.As a result, even in 1600°C ,green SiC can maintain stability to most strong acids and alkalis.
3. High Toughness.The toughness of silicon carbide abrasive refers to the difficulty of breaking under the action of external force. Taking F46 grit as an example, the toughness of carborundum tested by static pressure method is about 68-78%.Comparing with fused alumina, the mechanical strength of silicon carbide is higher. F120 for example, the compressive strength of silicon carbide is 186KN/cm2, and the compressive strength of corundum abrasive is 100KN/cm2.
4. Excellent thermal shock resistance with low thermal expansion coefficient. At a temperature of 25-1400 °C, the average thermal expansion coefficient of silicon carbide is 4.4x10-6/°C, while the thermal expansion coefficient of fused alumina is 7-8x10-6/°C.
5. High temperature resistance; high temperature strength. The melting point of green silicon carbide is 2600 °C, and the maximum operating temperature can reach 1900 °C. Applying silicon carbide to the inner wall of the engine can increase the life of the engine.
6. High purity. The green silicon carbide grain from us is milling from A grade green SiC block. Then sieve to high consistency particles.

 

 

Applications of Green silicon carbide grit

 

1. Precision polishing for hard optical glass such as camera lens.
2. Abrasive blasting on hard metal materials such as titanium alloy, carbide alloy, etc.
3. Polishing and grinding quartz glass.
4. Grinding hard stone, marbles, granite, etc.
5. Polishing PZT/ Piezoelectric ceramic.
6. Blasting copper and copper alloy.
7. Surface treatment on diamond tools.
8. Wire sawing.
9. Polishing jewelry such as diamond and cinnabar.
10. Grinding other thin brittle material precise component.

 

Specification of Green silicon carbide grit

 

Grit	1		2		3		3 and 4		5	Q5max,%
	W1,um	Q1,%	W2,um	Q2max,%	W3,um	Q3min,%	W4,um	Q3+Q4min,%	W5,um
F8	4000	0	2800	20	2360	45	2000	70	1700	3
F10	3350	0	2360	20	2000	45	1700	70	1400	3
F12	2800	0	2000	20	1700	45	1400	70	1180	3
F14	2360	0	1700	20	1400	45	1180	70	1000	3
F16	2000	0	1400	20	1180	45	1000	70	850	3
F20	1700	0	1180	20	1000	45	850	65	710	3
F24	1180	0	850	25	710	45	600	65	500	3
F30	1000	0	710	25	600	45	500	65	425	3
F36	850	0	600	25	500	45	425	65	355	3
F40	710	0	500	30	425	40	355	65	300	3
F46	600	0	425	30	355	40	300	65	250	3
F54	500	0	355	30	300	40	250	65	212	3
F60	425	0	300	30	250	40	212	65	180	3
F70	355	0	250	25	212	40	180	65	150	3
F80	300	0	212	25	180	40	150	65	125	3
F90	250	0	180	20	150	40	125	65	106	3
F100	212	0	150	20	125	40	106	65	90	3
F120	180	0	125	20	106	40	90	65	75	3
F150	150	0	106	15	90	40	75	65	63	3
F180	125	0	90	15	75	*	63	40	53	*
F220	106	0	75	15	63	*	53	40	45	*

 

FEPA Grit	ds50-value (μm)
F 230	53.0 ± 3
F 240	44.5 ± 2
F 280	36.5 ± 1.5
F 320	29.2 ± 1.5
F 360	22.8 ± 1.5
F 400	17.3 ± 1
F 500	12.8 ± 1
F 600	9.3 ± 1
F 800	6.5 ± 1
F 1000	4.5 ± 0.8
F 1200	3.0 ± 0.5
F 1500	2.0 ± 0.4
F 2000	1.2 ± 0.3

Contact:

Ms.Chen

Email: panchen@hxabrasive.com

Website: http://greensiliconcarbide.com

WhatsApp: 0086 13526538098