Reference

Abrasion-resistant coatings on spacer pads for fast breeder fuel assemblies

Abrasion-resistant coatings on spacer pads for fast breeder fuel assemblies. (Toshiba Corp., Japan). Jpn. Kokai Tokkyo Koho JP 58197203 A2 16 Nov 1983 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. 89086-20-4 and 10043-11-5 are cas registry numbers. These chemicals are also mentioned in this article. CLASS: IC: B22F007-04. APPLICATION: JP 82-78426 12 May 1982. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Section cross-reference(s): 71 The spacer pad is painted with a mixt. of powd. WC, Ni-Cr or Ni-P alloy, B, Si, C, and Fe mixed with a Cr binder to a paste, pressed, and sintered. Thus, a stainless steel plate was painted with a 100 g 5 m powder mixt. of WC 75, Ni-14% Cr 15, B 3.3, Si 4.0, Fe 2.0, C 0.7% mixed with 0.5 g Na CM-cellulose to a thickness of 1 mm, air dried, coated with a thin layer of BN, compacted at 1 ton/cm2, degassed at 450° and 10-4 torr for 10 min, and vacuum hot pressed at 0.1 ton/cm2 and 1050° for 3 min to give a coating 0.4 mm thick. When slid over Stellite at 4 kg/cm2 load and 2.5 m/s for 20 m, the resulting wear was ~25 mg/cm2, compared with ~175 for a sputtered coating contg. 0.1-0.2 mm Cr3C2 and Ni-Cr. .

Protective coating on tungsten-rhenium thermocouples by boron nitride

Protective coating on tungsten-rhenium thermocouples by boron nitride. Gimel'shtein, F. Ya.; Demin, V. N.; Mikheev, A. N. (USSR). Izmer. Tekh., (12), 45-6 (Russian) 1983. CODEN: IZTEAW. ISSN: 0368-1025. DOCUMENT TYPE: Journal CA Section: 56 (Nonferrous Metals and Alloys) The coating of W/W-Re thermocouples with BN ensures the formation of a thin dielec. layer, preventing nonthermal effects on wire performance. The unit for deposition of BN on thermocouples from the gas phase is described. 10043-11-5 and 6569-51-3 are also in the experiment. The B3N3H6 is a starting feed for the BN prepn. The optimal process time providing the layer thickness of 0.3-1m is 0.5-1 h at 750-800° and 10-1-10-2 torr. Since W and BN have close thermophys. characteristics, the protective layer is smooth, without pores and microcracks. .