Detail of "20620-87-5"

Reference

Manufacture of thermally conductive ceramics

Manufacture of thermally conductive ceramics. Ibukyama, Masahiro; Miyai, Akira; Ishii, Masaji; Nakajima, Masahiko (Denki Kagaku Kogyo K. K., Japan). Jpn. Kokai Tokkyo Koho JP 61227967 A2 11 Oct 1986 Showa, 7 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C04B035-58. APPLICATION: JP 85-67846 30 Mar 1985. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) Section cross-reference(s): 76 Double oxides of B and a Group 2 (IIA) or Group 3 (IIIB) element are added at 0.2-15 wt.% to AlN and the mixt. is sintered at 1600-1950° in a nonoxidative atm. to form a ceramic article with high thermal cond. Powd. Y2O3 (av. size d = 2 m) was mixed with B2O3 at a mol ratio of 1:1.05, heated at 1500° in air for 2 h, and ground to obtain a YBO3-based powder. Mixts. of YBO3 and AlN (d = 2.5 m) were mixed with 5% poly(Me methacrylate) PhMe soln., pressed at 500 kg/cm2 to form 3-mm-thick 40-mm-diam. plates, heated at 400° in N for 3 h to decomp. the polymer, and sintered. Plates of the invention had a relative d. (d. of the plate/d. calcd. from compn. 14060-30-1 and 20620-87-5 which are cas registry numbers of chemicals are mentioned.) >92% and heat cond. >77 W/m-K vs. 89.7% and 51 W/m-K, resp., for a control plate contg. 0.1 wt.% YBO3. Plates of the invention had smooth surface and satisfactory appearance. These plates are useful as substrates for electronics. .