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Chromium Boride Powder, CrB2 

Release time :2016/05/10
Chromium Boride Powder, CrB2


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Product Name: chromium diboride

The molecular formula of chromium diboride: b2cr

Molecular weight: 73.62

English Name: chromium boride (CrB2) EINECS: 234-499-3

Density: 5.15 English alias: chromium diboride; monochromium diboride

Flash point: melting point: 1550oc

It is used for the manufacture of high temperature electric conductor and alloy ceramics.

Chromium diboride (CRB_ 2) The coating has high melting point, high hardness, high 

wear resistance and corrosion resistance. In addition, it has good chemical inertia and 

is not easy to bond with metal. As a hard protective coating, it is expected to meet these 

special chip processing requirements. This paper is mainly based on the domestic and 

foreign CRB_ The research progress and development trend of hard coatings are focused 

on CRB deposition by composite PVD technology_ The preparation, structure and properties 

of the coating were studied. The results have important scientific significance and application 

value. Firstly, CRB was deposited by high power pulsed magnetron sputtering (hipims)_ 

The composition, phase structure and mechanical properties of the coating were characterized. 

The friction and wear behavior of the coating in different test environments (dry friction, 

distilled water and sea water) were studied. The results show that: CRB_ The coating 

shows (101) preferred orientation, and the main phase structure is CRB_ The atomic ratio 

of B / Cr is 1.76, the hardness and elastic modulus are 26.9 ± 1.0 GPA and 306.7 ± 6.0 GPA, 

respectively. The friction coefficients of the coating in dry friction, distilled water and seawater 

are 0.75, 0.26 and 0.22, respectively. The friction coefficient of the coating in distilled water 

and sea water environment is significantly reduced due to the boundary lubrication of distilled 

water and sea water. The friction and wear mechanism of the coating in dry friction and distilled 

water environment is abrasive wear, while in seawater environment, the friction coefficient of 

the coating decreases obviously, It is the synergistic effect of corrosive wear and abrasive wear. 

Secondly, as a comparison with hipims, the CRB is obtained by DC magnetron sputtering by 

adjusting the target base distance_ The atomic ratio of B / Cr varies from 1.9 to 2.0 with the 

change of deposition temperature. XPS results show that the coating is still mainly composed 

of CRB_ The results show that the roughness of the coating is small and the RQ is between 

1.11 nm and 1.95 nm. With the increase of deposition temperature, the diffusion ability of 

adsorbed atoms on the substrate surface is enhanced, and the crystallinity of the coating 

gradually increases, and the crystal structure changes from the mixed orientation of (101) 

and (001) to (001) preferred orientation; the cross-sectional morphology of the coating 

changes from porous fibrous structure to coarse columnar structure (about 50 nm in diameter), 

Finally, it transformed into a dense nano columnar structure (about 4 ~ 7 nm in diameter). 

With the increase of deposition temperature, the mechanical properties of the coating are 

improved obviously. When the deposition temperature is higher than 300 ℃, superhard CRB 

with hardness greater than 40 GPA can be obtained_ When the deposition temperature is 

400 ℃, the hardness of the coating is as high as 50.7 ± 2 GPa. The evolution of microstructure 

and mechanical properties with the deposition temperature is attributed to the (001) preferred 

orientation and densification of the microstructure due to the enhanced diffusion of the deposition 

atoms. Finally, CRBs with (101) and (001) preferred orientations are also studied_ The thermal 

stability of the coating was tested, and the CRB substrate and CRB at different deposition 

temperatures were tested_ The basic electrochemical properties of 2 coating in 3.5 wt.% 

NaCl solution were investigated. The results show that: (101) preferred orientation of CRB_ 

A new phase was formed at 1000 ℃, and (001) preferred orientation of CRB_ The results 

show that the (101) - oriented CRB coating exhibits higher high temperature stability due to 

the (101) preferred orientation of CRB_ The results show that the CRB coating has higher 

surface energy and lattice distortion energy than CRB_ The corrosion potential of crb-2 coating 

was higher than that of cemented carbide, but the corrosion current density decreased by 

nearly two orders of magnitude_ 2 coating can effectively protect cemented carbide.

                                                                                             

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