Abstract:
PURPOSE:To improve the effect of a compression treatment, by placing a plate- shaped condensable material opposite to the part near the opening of a rigid vessel, providing an explosives layer on the top surface thereof and initiating the same. CONSTITUTION:A sample 1 is installed in parallel with the flat base of a vessel 2 provided with a space 3. The vessel 2 is made of a stainless steel or the like. The top surface of the sample 1 is covered with a metallic plate 4 over the entire surface and an explosives layer 5 is further provided thereon. Penthrite, hexogen, etc. are used for the kind of the layer 5. The distance of the space 3 where the sample scatters is at least >=5mm.. The explosives 5 are initiated by using only the detonator at the right or left end or in the central part at the top end of the explosives 5 or the explosives are flatly initiated.
Abstract:
PURPOSE:To inexpensively manufacture cubic boron nitride in a high yield by applying a thermodynamically stable pressure for shock wave pressurization obtd. by hitting a flying plate by the explosion of an explosive to rhombic boron nitride to cause nondiffusion type conversion. CONSTITUTION:Rhombic boron nitride purified to the utmost and having high crystallizability is pulverized to = about 80wt% metallic powder such as copper powder having
Abstract:
PURPOSE:To compress and deform a pipe with strong electromagnetic force and compose a raw material under ultrahigh voltage by supplying impulse power to the outer pheripheral coiled device of a pipe vessel, in which the raw material is packed and sealed, from a capacitor. CONSTITUTION:Impulse power is supplied to coil 5 of feed shaver 4 from capacitor 6 when switch 7 is turned on. At the time, changing magnetic field generates around coil 5 and the magnetic field acts on opposite pipe vessel concentratedly from the convex part 41 of shaver. Induced current flows into pipe 1 and strong electromagnetic force which can depress pipe 1 by the interaction of the induced current and deformation magnetic field acts on pipe 1, so that pipe 1 is compressed and deformed and impact force is applied to raw material 3 inside the pipe from the periphery to the center.
Abstract:
PURPOSE:To synthesize diamond or cubic system boron nitride by giving dynamic collision energy from a ram through a punch indirectly to powdered sample thereby the powdered sample is microscopically distorted. CONSTITUTION:A cylinder 11 and a cradle 12 are mounted on a lower board 6. The cradle 12 is fitted to the cylinder 11. A set of the cylinder 11, the cradle 12 and a punch 13 is inserted into a support block 14 in the form of a sleeve to form an assembly. The assembly is fixed on the lower board 6. The central convex part 16 of the cradle 12 is fitted to a through-hole 15 within the cylinder 11. There is a space on the central convex part 16. A sample 17 and a punch 13 are arranged within the space. The punch 13 is arranged within the cylinder 11 and the convex end from the cylinder 11 is struck with a ram 7. As this shock is given by free drop or forced frop of the ram 7, collision energy is given through the punch 13 to the sample 17.
Abstract:
PURPOSE:To reduce the time required to convert a reaction sample contg. hexagonal system boron nitride into cubic system boron nitride and to raise percentage of recovery by holding the sample at a predetermined high temp. and applying a high press. as a dynamic press. due to striking energy to the sample. CONSTITUTION:Hexagonal system boron nitride 1 press formed into, e.g. a cylindrical shape is put into alumina pipe 2, and a little H2O is added as catalyst. Platinum resistance wire 3 is wound round pipe 2, and pipe 2 is buried in talc press. medium 4. Medium 4 is then set in cylinder 6 combined with lower punch 5, and upper punch 7 is mounted on medium 4. After heating pipe 2 to 1300 deg.C by supplying an electric current to wire 3, the ram of a forging machine is dropped onto punch 7 to apply striking energy of 3 tons meter or more to sample 1. Thus, the resulting hexagonal system boron nitride is recovered by almost 100%. By adding a flux to sample 1 hexagonal system boron nitride is obtd. more reliably. The flux usually includes Ia, IIa and IIIa group elements and metallic elements such as Sb and Sn.