Interfacial reaction of aluminum borate whisker reinforced Mg-10Gd-3Y-1Zn-0.4Zr (wt%) alloy matrix composite

Chang, Zhiyu; Li, Qiao; Wu, Yujuan; Su, Ning; Deng, Qingchen; Ding, Chenbo; Iizuka, Tateoki; Peng, Liming; Ding, Wei

doi:10.1016/j.matchar.2021.111649

Cited by 10 publications

(1 citation statement)

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“…A characteristic feature of aluminium borates is the ability to form needle-like crystals. Currently, the use of needles/whiskers of aluminium borate for strengthening alloys comes to the fore [27]. Due to the ability of needle-like crystals to pierce cells' walls, aluminium borate is used in genetic engineering [28].…”

Section: Discussionmentioning

confidence: 99%

Effect of Thermochemical Boronizing of Alumina Surface on the Borate Crystals Growth and Interaction with Nickel and Nickel Alloy

Škamat

Lebedev²,

Černašėjus³

et al. 2022

Crystals

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Wettability at the metal-ceramic interface is highly important for the development of modern composite materials. Poor wettability by metal melts restricts the use of alumina in protective metal matrix composite (MMC) coatings. In the present experimental study, the possibility to modify wetting properties of alumina by thermochemical surface boronizing was investigated. The results of SEM, EDS, XRD and XPS characterisation of surfaces revealed the formation of oxygen containing Al–B compounds identified as aluminium borates (Al18B4O33/Al4B2O9); no signs of non-oxide Al–B compounds were observed. The shape of the single splats deposited on the boronized alumina surface by the thermal spray and re-melted in the furnace revealed that significant wetting improvement by self-fluxing nickel alloy did not occur. However, the improvement of adhesion between the nickel/nickel alloy and Al2O3 surface was obtained due to formation of an intermediate layer consisting of B, O, Al and Si between the metal and ceramic surfaces at the presence of some silicon at the modified surfaces. The presented study demonstrates that the thermochemical boronizing of alumina in amorphous boron medium is a simple method to obtain a thin aluminium borate layer consisting of oriented nano-rod-like crystals, whose growing direction is predetermined by the orientation of the alumina grains’ faces at surface.

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Section: Discussionmentioning

confidence: 99%