Titanium boride TiB

BjTij(cr) Titanium boride (TiB) 256 1 Sodium borate (Na28g0j Q) 304... 

When zirconium silicate (ZrSi04) or a mixture of Z1O3 and SiOj is reacted with aluminum in the presence of aluminum oxide and then rdieated, zirconium silicide (ZrSi ) becomes the major product. Titanium dioxide (TiOs) and boron (111) oxide (BgO,) with aluminum similarly form titanium boride (TiBs). If the reduction of the oxides such as TiOg or Si02 with aluminum is performed in the presence of carbon black, the carbides TiC and SiC are formed embedded in aluminum oxide. This subject is also treated in a British patent titled Autothermic Fired Ceramics. ... 

Five phases of titanium boride have been reported. TiB2 [12405-65-35] Ti2B [12305-68-9] TiB [12007-08-8] [ 2447-59-5] and TiB 2 [51311-04-7]. 

Five phases of titanium boride have been reported. TiB2 [12405-65-35], TL,B [12505-68-9], TiB [12007-08-8], TL,B5 [12447-59-5], and TiB12 [51311-04-7]. The most important of these is the diboride, TiB2, which has a hexagonal structure and lattice parameters of a = 302.8 pm and c = 322.8 pm. Titanium diboride is a gray crystalline solid. It is not attacked by cold concentrated hydrochloric or sulfuric acids, but dissolves slowly at boiling temperatures. It dissolves more readily in nitric acid/hydrogen peroxide or nitric acid/sulfuric acid mixtures. It also decomposes upon fusion with alkali hydroxides, carbonates, or bisulfates. 

Although rather unreactive at ordinary temperatures, titanium combines directly with most non-metals, for example, hydrogen, the halogens, oxygen, nitrogen, carbon, boron, silicon, and sulfur, at elevated temperatures. The resulting nitride, TiN, carbide, TiC and borides, TiB and TiB2, are interstitial compounds which are very stable, hard and refractory. 

Titanium diboride, TiB2, is, perhaps, the most heavily studied of all the metal borides and is used extensively in a diversity of applications. Several titanium borides are known (including Ti2B, TiB, TiBi, and Ti2B5) however, titanium diboride is the most... 

Rep] reported the formation of new boride phases Ti2B5, TiBi2, TiB. 25, TiB. 55, and TiB ioo in the combustion products for B-Fe-Ti, B-Ni-Ti, B-Cu-Ti, and B-Si-Ti reaction powder mixtures. The new titanium borides revealed in the B-Ti system may result fiom stabilization by oxygen. Crystal stractures of equihbrium and nonequihbrium phases are presented in Table 2. 

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