Electrolytic Preparation of Zirconium and Hafnium Diborides Using a Molten Cryolite-base Electrolyte.
Gomes JM; Uchida K
U S Pat 3 769 185 1973 Oct; :
Zirconium and hafnium diborides are synthesized in pure form from a molten cryolite bath under atmospheric conditions by electrolysis at 950 deg.-1050 Deg. C at a cathode current density of 10-225 a/dm2. The bath also contains small amounts of naoh or na2co3 and a sodium borate. Source compounds may be zr or hf oxides, the na salts of their oxyacids, or both with the atomic ratio of zr and hf to b of 1:4.5:2. Yields of zrb2 and hfb2 of 0.31 and 0.50 G/a-h, respectively, were obtained.
U.S. Pat. 3,769,185; Oct. 30, 1973; Chem. Abstr. 80:9,869Z
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.