排序方式: 共有13条查询结果,搜索用时 78 毫秒
1.
Interfacial structure and reaction mechanism of AlN/Ti joints 总被引:2,自引:0,他引:2
Bonding of AlN to Ti was performed at high temperatures in vacuum. The bonding temperature ranged from 1323 to 1473 K, while
the bonding time varied from 7.2 up to 72 ks. The reaction products were examined using elemental analysis and X-ray diffraction.
TiN, Ti3AlN (τ1), and Ti3Al were observed at the AlN/Ti interface, having various thickness at different bonding conditions.
The thickness of TiN and Ti3AlN layers grew slowly with bonding time. On the other hand, growth of the Ti3Al layer followed
Fick’s law. The activation energy of its growth was found to be 146 kJ mol-1. When thinner Ti foil (20 μm) was joined to AlN
at 1473 K for a long time (39.6 ks), the Ti central layer has completely consumed and another ternary compound Ti2AlN(τ2)
started to form. A maximum bond strength was achieved for an AlN/Ti (20 μm) joint made at 1473 K for 28.8 ks, after which
the bond strength of the joint deteriorated severely.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
2.
An ultrasonic wave was applied during brazing of alumina to Cu. First alumina was metallized by applying ultrasonicwave in braze bath. Then the metallized alumina was brazed with Cu using the same filler alloy. The filler used wereZn-Al alloys and Zn-Sn A 相似文献
3.
4.
ON THE PARAMETER-SPACE CLASSIFICATION OF THE DYNAMIC BEHAVIOR OF A CONTINUOUS MICROBIAL FLOW REACTOR
SHIGEHARU SUZUKI KAZUYUKI SHIMIZU MASAKAZU MATSUBARA 《Chemical Engineering Communications》2013,200(5-6):325-335
Recently Agrawal et al.1 classified the dynamic behavior of continuous stirred tank fermentor for the Monod's model and the two parameter hump function model with variable yield coefficient in the parameter space. We employed the more general three parameter substrate inhibition model which includes the Monod's model as a limiting case, derived the boundary equations which rigorously divide the parameter space of different dynamic behavior, and showed the interesting phenomenon that a limit cycle suddenly vanished for the slight change in the Damköhler number by computer simulation. 相似文献
5.
Effect of Water on Transformation of Amorphous Silica to Coesite 总被引:1,自引:0,他引:1
6.
SHIGEHARU NAKA SUKETOSHI ITO MICHIO INAGAKI 《Journal of the American Ceramic Society》1974,57(5):217-219
The process of formation of coesite was investigated kinetically at 550° to 900°C under 23 to 55 kbars pressure using amorphous silica and quartz as starting materials. When amorphous silica transformed to coesite, strained quartz was observed as an intermediate phase. The rate process was concluded to be consecutive through quartz. When quartz transformed to coesite, a similar strained quartz was recognized as an intermediate stage from the broadness of the diffraction lines of the quartz phase. In the transition from amorphous silica, the formation rate of coesite increases with increasing pressure up to 40 kbars at 550°C but then decreases under pressures as high as 55 kbars. At 900°C, the formation of coesite from quartz was faster than that from amorphous silica under 23 and 31 kbars but slower under 40 kbars. These results are explained by assuming that the rate constant for each step depends on temperature and pressure. 相似文献
7.
SHIN-ICHI HIRANO TAKAYUKI YAMAGUCHI SHIGEHARU NAKA 《Journal of the American Ceramic Society》1981,64(12):734-736
Aluminum nitride was found to act as the catalyst for the synthesis of cubic BN by sealing the mixture of hexagonal BN and AIN in a pressure cell under the inert or reducing atmosphere. No conversion of hexagonal BN to cubic BN was observed under pressures below 7×109 Pa (7 GPa, 70 kbar) without AIN addition. All hexagonal BN could be completely converted to cubic BN under 6.5 GPa at 1600°C by the addition of 20 mol% AIN. The cubic BN thus synthesized was a typical tetrahedron (grain size ≅2 μm). The pressure-temperature diagram for the synthesis of cubic BN was determined at >7 GPa and T <1700°C. 相似文献
8.
9.
10.