Description

Boron Carbide F36, F46, F320 for Diamond Grinding Wheel Additives

Boron carbide (B₄C) F36, F46 and F320 grades are specially engineered functional raw materials designed as key additives for manufacturing resin, metal and vitrified bonded diamond grinding wheels. Known as one of the third hardest man-made materials, boron carbide delivers outstanding hardness, wear resistance and stable chemical performance, making it an ideal auxiliary abrasive filler for diamond wheel formulations.

Diamond abrasives feature ultra-high hardness, yet they face limitations in self-sharpening performance and machining adaptability when used alone. Appropriately graded boron carbide powder works as a critical complementary component inside the grinding wheel matrix. Coarse grades F36 and F46 possess sharp particle edges and strong cutting capacity. When blended into diamond wheel raw materials, they assist in micro-cutting during grinding, improve the wheel’s cutting efficiency, reduce grinding resistance and lower surface burn risk on workpieces. Fine grade F320 boron carbide optimizes the structure of the wheel binder, fills tiny voids inside the matrix, enhances the compactness and overall structural strength of the grinding wheel.

Our boron carbide strictly follows standard F-size grain distribution. Each grade maintains centralized particle size, low impurity content and good flowability, which ensures homogeneous mixing with diamond powder, metal powder and resin binders. Unlike ordinary abrasives, boron carbide boasts excellent inertia. It will not react with most bonding systems during hot pressing and sintering processes, helping the grinding wheel maintain stable performance under continuous high-load grinding conditions.
Adding boron carbide F36, F46 and F320 brings multiple tangible benefits to diamond grinding wheels. It effectively balances the hardness and toughness of the wheel, improves self-sharpening property, prevents premature passivation of diamond grains, and extends the service life of finished wheels. Finished diamond wheels with boron carbide additives perform excellently for processing hard alloys, ceramics, optical glass and semiconductor materials.

We provide consistent quality and customizable packaging for bulk export. Whether for mass production of precision grinding wheels or customized abrasive tool development, our graded boron carbide serves as a reliable additive solution for global diamond abrasive manufacturers.

Physical and technical specifications:

Appearance	Black grain or powder
Molecular Weight(g/mol.)	55.25515
Specific Heat(cal-mol-c)	12.5
Elastic modulus	450-470 Gpa
Knoop hardness	2750 kg/mm2
Mohs hardness	9.3
Micro Hardness	4950 KGF/mm2
Density	2.52g/cm
Melting point	2350℃(2623.15K)
Boiling point	＞3500℃(＞3773.15K)
conductivity	140 s/cm
thermal conductivity	30 – 42 W/M·K
thermal neutron absorption cross section	600 barn
Solubility in water	Insoluble
Crystal structure	Rhombohedral
（CAS NO.)	12069-32-8

Chemical composition:

Chemical	Standard Value	Typical Value
Total Boron (BT)	75-80 %	78.18 %
Free Boron(BF)	≤0.5 %	0.1 %
Boron Oxide（B2O3）	≤1.0 %	0.09 %
Total Carbon (CT)	17-21.5%	19.71 %
Free Carbon (CF)	≤2.0 %	1.24 %
Iron Oxide（Fe2O3）	≤0.5 %	0.16 %
Boron Carbide（B4C）	93-97 %	96.55 %
BT+CT	93-98%	97.89 %

Boron carbide size:

Grit Size	Mean diameter in um
F8	2460
F10	2085
F12	1765
F14	1470
F16	1230
F20	1040
F22	885
F24	745
F30	625
F36	525
F40	438
F46	370
F54	310
F60	260
F70	218
F80	185
F90	154
F100	129
F120	109
F150	82
F180	69
F220	58

Grit Size	Mean grain size ds50-value in 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