Synthesis of cubic aluminum nitride by carbothermal nitridation reaction

Wang, J.; Wang, W.L.; Ding, P.D.; Yang, Yan-Qing; Fang, Lili; Esteve, J.; Polo, M.C.; Sánchez, G.

doi:10.1016/s0925-9635(99)00134-x

Cited by 37 publications

(20 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fabricated coating consists of c-AlN (rock-salt and zinc-blend structures), h-AlN, Al 2 O 3 , Al 5 O 6 N and cubic sphalerite ALON. The appearance of the ALON phase is related to the transformation of AlN, and it agrees with previous reports by J. Wang et al [28] and F. Boey et al [29]. The formation of the AlN zinc-blend phase when using AlN/Al mixed powder is attributed to transformation from the hexagonal AlN feedstock powder.…”

Section: Discussionsupporting

confidence: 91%

“…The formation of the ALON phase is attributed to an interaction between AlN and oxygen under high temperatures as reported by J. Wang et al [28] and F. Boey et al [29]. F. Boey et al reported that the presence of oxygen can induce the AlN phase to convert to aluminum oxynitride.…”

Section: Discussionmentioning

confidence: 62%

“…Furthermore, the disappearance of the ALON phase in the center of the coating is due to decreasing amounts of oxygen. Additionally, J. Wang et al [28] reported that ALON can produce the c-AlN phase. The formation of Al 2 O 3 and Al 5 O 6 N in the coating is attributed to the interaction of Al with the surrounding N 2 plasma and atmospheric oxygen, which agrees with its appearance only in the case of Al powder.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

et al. 2011

View full text Add to dashboard Cite

Abstract:Reactive plasma spraying is a promising technology for the in situ formation of aluminum nitride (AlN) coatings. Recently, it became possible to fabricate cubic-AlN-(c-AlN) based coatings through reactive plasma spraying of Al powder in an ambient atmosphere. However, it was difficult to fabricate a coating with high AlN content and suitable thickness due to the coalescence of the Al particles. In this study, the influence of using AlN additive (h-AlN) to increase the AlN content of the coating and improve the reaction process was investigated. The simple mixing of Al and AlN powders was not suitable for fabricating AlN coatings through reactive plasma spraying. However, it was possible to prepare a homogenously mixed, agglomerated and dispersed Al/AlN mixture (which enabled in-flight interaction between the powder and the surrounding plasma) by wet-mixing in a planetary mill. Increasing the AlN content in the mixture prevented coalescence and increased the nitride content gradually. Using 30 to 40 wt% AlN was sufficient to fabricate a thick (more than 200 µm) AlN coating with high hardness (approximately 1000 Hv). The AlN additive prevented the coalescence of Al metal and enhanced post-deposition nitriding through N 2 plasma irradiation by allowing the nitriding species in the plasma to impinge on a larger Al surface area. Using AlN as a feedstock additive was found to be a suitable method for fabricating AlN coatings by reactive plasma

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

et al. 2011

View full text Add to dashboard Cite

show abstract

“…9) However, synthesis of c-AlN is more difficult than h-AlN because it is a meta-stable phase. Its synthetic methods can be classified into three main types: the carbothermal reduction and nitriding (CRN) of Al 2 O 3 , 9,10) the solvothermal decomposition of [Al (urea) 3 ]Cl 3 , 11) and the reaction of AlCl 3 with NaN 3 or Li 3 N in organic solvents.…”

Section: )mentioning

confidence: 99%

Synthesis of Cubic Aluminum Nitride Coating from Al<sub>2</sub>O<sub>3</sub> Powder in Reactive Plasma Spray Process

et al. 2013

View full text Add to dashboard Cite

Plasma spraying is a versatile technique for producing abradable and protective ceramic coatings. However, it was difficult to fabricate aluminium nitride (AlN) coating by conventional plasma spray processes. It is due to the thermal decomposition of the feedstock AlN powder during spraying without a stable melting phase. Reactive plasma spraying (RPS) has been considered as a promising technology for in-situ formation of AlN thermally sprayed coatings. This study investigated the feasibility of reactive plasma spraying of Al 2 O 3 powder in N 2 /H 2 plasma upon fabrication of AlN coating. It was possible to fabricate a cubic-AlN (c-AlN)/Al 2 O 3 composite coating and the fabricated coating consists of c-AlN, ¡-Al 2 O 3 , Al 5 O 6 N and £-Al 2 O 3 . Furthermore, the AlN content was improved with increasing the flight time (spray distance), due to increasing the reaction time between the Al 2 O 3 particles and the surrounding N 2 /H 2 plasma. It was possible to fabricate coating contains about 97% of c-AlN. However, it was difficult to clarify the in-flight reaction during the coating process, due to losing the particles shape and features after colliding and flattening on the substrate surface. The sprayed particles were collected into a water bath to maintain its particle features in order to investigate the in-flight reaction. It was clear from the microstructure and the cross section observation of the collected particles that, the nitriding reaction started from the surface. During the coating process, the sprayed particles were melted, spheroidized and reacted in the high temperature N 2 /H 2 plasma and formed aluminum oxynitride (Al 5 O 6 N) which have cubic structure. The particles collided, flattened, and rapidly solidified on a substrate surface. The Al 5 O 6 N is easily converted to c-AlN phase via continuous nitriding (both have the same cubic symmetry: cubic and closely packed) during the rapid solidification and plasma irradiation on the substrate. The high quenching rate of the plasma flame prevents the AlN crystal growth to form the hexagonal phase. Therefore, it was possible to fabricate c-AlN/Al 2 O 3 composite coatings through reactive plasma nitriding of Al 2 O 3 powder and the nitriding process of the Al 2 O 3 particle as well as the formation process of cAlN phase were investigated.

show abstract

“…Moreover, AlN powders were consisted of wurtzite hexagonal and cubic AlN which had higher thermal conductivity. It is well known that the thermal conductivity of cubic AlN (about 250-600 W m −1 · K −1 ) is larger than that of hexagonal AlN [15]. So, we think that the formation of cubic AlN will increase the thermal conductivity of the AlN sintered product or AlN/polymer composites.…”

Section: Introductionmentioning

confidence: 87%

Aluminum Nitride Formation From Aluminum Oxide/Phenol Resin Solid-Gel Mixture By Carbothermal Reduction Nitridation Method

Mylinh

Yoon

Kim

2015

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Hexagonal and cubic crystalline aluminum nitride (AlN) particles were successfully synthesized using phenol resin and alpha aluminum oxide (α-Al 2 O 3 ) as precursors through new solid-gel mixture and carbothermal reduction nitridaton (CRN) process with molar ratio of C/Al 2 O 3 = 3. The effect of reaction temperature on the decomposition of phenol resin and synthesis of hexagonal and cubic AlN were investigated and the reaction mechanism was also discussed. The results showed that α-Al 2 O 3 powder in homogeneous solid-gel precursor was easily nitrided to yield AlN powder during the carbothermal reduction nitridation process. The reaction temperature needed for a complete conversion for the precursor was about 1700• C, which much lower than that when using α-Al 2 O 3 and carbon black as starting materials. To our knowledge, phenol resin is the first time to be used for synthesizing AlN powder via carbothermal reduction and nitridation method, which would be an efficient, economical, cheap assistant reagent for large scale synthesis of AlN powder.

show abstract

Synthesis of cubic aluminum nitride by carbothermal nitridation reaction

Cited by 37 publications

References 2 publications

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

Synthesis of Cubic Aluminum Nitride Coating from Al<sub>2</sub>O<sub>3</sub> Powder in Reactive Plasma Spray Process

Aluminum Nitride Formation From Aluminum Oxide/Phenol Resin Solid-Gel Mixture By Carbothermal Reduction Nitridation Method

Contact Info

Product

Resources

About