Lanthanum boride sintered body and method for producing the same
US9257210B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2013 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Apr 29, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/87
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A lanthanum boride sintered body includes a phase including lanthanum and silicon at grain boundaries between crystal grains of lanthanum boride. In this lanthanum boride sintered body, the phase exists in various configurations such as a phase present at a triple point of grain boundary, and a phase present along the grain boundary. This phase is based on a lanthanum silicide (represented by the composition formula LaSix (0<x≦2)). The lanthanum boride sintered body is fabricated through a sintering step of sintering a lanthanum boride green compact by press-free sintering in an inert atmosphere or under vacuum in the presence of a silicon-containing material around and/or within the green compact. The lanthanum boride sintered body having this structure exhibits a relative density of not less than 92%, and more preferably not less than 94%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.