Skip to main content

Formation Process of AlN Through Precursors and Its Application to Joining AlN Ceramics

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Formation process of AlN from urea and aluminum chloride hexa‐hydrate (N/Al = 60) under nitrogen is investigated. An aluminum hexa‐urea complex crystallizes on mixing the two raw materials at room temperature. The complexes react with excess urea and/or its decomposed products, such as biuret above 160°C, and form an amorphous phase containing Al, N, C, and O around 400°C after releasing volatile products. The resultant amorphous phase undergoes changes as the temperature increases, and then crystalline carbon with a fullerene‐like XRD pattern forms at 850°C. AlN crystallization follows the decomposition of the fullerene‐like crystals. At the AlN precursor stage, a large number of radicals (= 2.0029 and = 1/2) are detected by ESR. The radicals are assumed to be due to dangling bonds with an unpaired electron in amorphous carbon. Joining AlN ceramics is conducted using the 850°C product at the AlN precursor stage as the filler material, and is successfully achieved at temperatures above 1000°C. The shear strengths of the joints formed at 1500°C are 88 ± 29 MPa.

Document Type: Research Article

DOI: https://doi.org/10.1111/jace.12010

Publication date: 2012-12-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more