What is Aluminum Boride? Aluminium boride particles have been produced within Al-3wt%B alloy via melting and cooling experiments. Boride particles have dispersed in the aluminium matrix homogeneously. In general, particles have been found to have a high aspect ratio of flakes or platelets. The width of platelets was several hundred microns, while their thickness was only a few microns. The high aspect ratio flakes are attributed to be AlB2 which were formed by direct nucleation and growth process from the melt below the peritectic transition temperature due to fast cooling from 1300 oC to 700 oC. Non-flake shape particles (cubic or tetrahedral) have also been found in the microstructure. This was attributed to the nucleation of higher boride particles above the peritectic transformation temperature. Formation of non-flake boride particles is not desirable in manufacturing metal matrix composite, and therefore, their formation should be avoided by faster cooling than obtained in this work. The present work has demonstrated that a new family of in-situ metal matrix composites (MMCs) based on high aspect ratio AlB2 can be developed. Preparation of these MMCs involves the conversion of low aspect ratio AlB2 to high aspect ratio AlB2 by controlled heating and cooling processes. This conversion is associated with the Al(L) + AlB12 AlB2 peritectic transformation.
Experimental Procedure of Aluminum Boride Aluminium matrix composites reinforced with ceramic particles exhibit a lower wear rate than pure aluminium or aluminium alloys. However, the types of reinforcement particles do not significantly influence the wear and friction properties of the composites. On the other hand, the volume fraction of reinforcement does affect the wear rate excessively. It has been claimed that in an in-situ AlB2 reinforced Al matrix composite, at a volume fraction of 20 % reinforcement, the composite showed an 80 % increase in strength compared to 10 % reinforcement. An SEM image of deeply etched Al-% 3wt% B alloy produced by argon quenching from 1300 oC is shown in Fig.3, which presents the resulting microstructure with AlB2 flake reinforcements embedded in the aluminium matrix. The spongy view of the matrix is due to the hasty etching effect of the 10 %HCl solution used for deep etching processes.
The formation of cubic or tetragonal AlB12 boride particles cannot be totally avoided The SEM image of the aluminium boride particles was removed by filtering after the aluminium matrix was entirely dissolved within a 10 %HCl solution. Alongside the thin wide high, aspect aluminium boride particles, some cuboidal or tetrahedral particles are also evident. The possible reason is that some AlB12-type boride had formed before the AlB2 flakes crystallized within the Al matrix. The formation of higher boride particles before the AlB2 nucleate could be avoided by increasing the cooling rate of the sample. These AlB12 particles have probably transformed into AlB2 later by the A1B12 + Al(liq.) to A1B2 + Al(liq.) peritectic reaction at 980 °C. Higher borides type particles, especially AlB12, are reported to be brittle, and they degrade the properties of the in-situ formed Al-B reinforced composites. Commercial aluminium master alloys containing boron (with either AlB2 or AlB12 particles) are currently used as grain refiners in aluminium alloys. The diborides are effective nucleation sites for aluminium, so the wettability of the reinforcement by liquid and solid Al is a non-issue. At the same time, the chemical reactivity between particles and melt is minimized. Suppose a good volume of flake aluminium boride can be produced within the Al-B microstructure. In that case, significant cost savings will be achieved in manufacturing a new in-situ metal matrix composite compared to SiC or Al2O3 composites because the need to combine the reinforcement and the matrix is eliminated.
Price of Aluminum Boride Aluminum Boride particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Aluminum Boride. A large amount of large amount will be lower. The Price of Aluminum Boride is on our company's official website.
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