Showing papers on "Titanium powder published in 1980"

Developments in Titanium Powder Metallurgy

Abstract: The high buy-to-fly ratio associated with many titanium components, combined with forging and machining difficulties, and recent availability problems, has led to a strong drive for near-net titanium shape fabrication. A very promising method of attaining this goal is powder metallurgy. Two major approaches are considered in this article: the “elemental” and “pre-alloyed” powder methods. Shape-making capability and mechanical properties of both technologies are presented. Consideration is given to the cost-effectiveness of the processes and mechanical performance compared to conventional fabrication methods. Design philosophies, modified to include the presence of foreign particles in the compacted article, are discussed. Emerging advances in the technology are presented and future developments forecast.

Titanium Powder Metallurgy — A Perspective

Abstract: Titanium alloys, by virtue of their attractive strength-to-density ratio, fatigue, fracture toughness, and corrosion resistance, are logical candidates for many aerospace applications However, high fabrication and machining costs, augmented by recent sponge availability problems and sharply rising material costs, have consistently caused sharp reductions in the extent of titanium usage from conception to final design of major aircraft systems Of the “near-net shape” processes recently developed or advanced for the purpose of reducing material input and machining for titanium alloy part production, powder metallurgy exhibits the widest range of process variations and potential applications in airframe and aeropropulsion systems

Separating method for hydrogen from synthetic gas

Abstract: PURPOSE:To prevent sintering of titanium at the time of heating and efficiently separate hydrogen by mixing carbon powder, graphite powder, etc. into metallic titanium powder; contacting this mixed powder to a synthetic gas to form titanium hydride; and heat-decomposing the titanium hydride to separation-recover hydrogen. CONSTITUTION:About 0.1-50, pref. 1-20wt% of carbon powder, graphite powder, aluminum powder or powder of a transition metal such as Fe, Co, Ni or Cu, powder of a slightly reducing oxide such as MgO, ZnO, SiO2 or Al2O3, etc. is mixed into titanium hydride. This mixed powder is heated at about 650-700 deg.C for about 1-2hr in case of ordinary press. to convert the titanium hydride in the mixed powder into active metallic titanium, which is then contacted to a synthetic gas to allow hydrogen in the gas to be selectively absorbed. The resulting titanium hydride is heat-decomposed to separation-recover hydrogen, and metallic titanium powder thus formed is reused in absorption of hydrogen.

Production of sintered compact particles

Abstract: PURPOSE: To produce sintered compact articles of desired shapes without using any exclusive dies by disposing an ingot body of a suitable shape into dies, packing powder for sintering into the spaced formed by this, and compression molding the same followed by heating. CONSTITUTION: An ingot body which has good wettability with sintered compact articles, and of which the melting temp. is lower than the sintering temp. of powder is selected for the ingot body to be used. For example, if the powder for sintering is iron powder or titanium powder, copper or copper alloy is used. A cylindrical ingot body 2 of which the outside diameter is smaller than the inside diameter of a general-purpose die 1 is disposed in the die 1. Powders 3a and 3b are packed in the formed space part, and are compression molded. Thence, the green compat is heat treated, whereby a cylindrical sintered compact article and a circular cylindrical sintered compact article are produced simultaneously. Simultaneous production of dissimilar kinds of sintered compact articles is also possible. COPYRIGHT: (C)1982,JPO&Japio

Builttup diamond tool and its manufacturing method

Abstract: PURPOSE:To firmly hold a very hard diamond cutter by a flat titanium holder with large mechanical strength and high thermal resistance, by melting titanium powder contained in the cutter and sinter-bonding it to the holder CONSTITUTION:A mixture for forming a diamond cutting tool, composed of diamond powder and titanium alloy powder of three-dimensional network structure, is compressed to form a cutter on the one hand Titanium alloy powder is presintered to form a flat titanium holder on the other The cutter form is laid upon the holder form to get a built-up tool form This built-up form is treated in a high pressure and high temperature atmosphere to melt the titanium alloy and sinter both forms Thus the holder with large mechanical strength and high thermal resistance can firmly hold the very hard diamond cutter through a bonding layer

Manufacture of cubic system boron nitride solidified body

Abstract: PURPOSE:To manufacture a solidified body with superior mechanical characteristics, etc by sintering a mixt of cubic system boron nitride powder, titanium nitride- titanium oxide mixed powder and metallic titanium powder while sepcifying sintering press and heating condtions to the sintering temp CONSTITUTION:A mixt of cubic system boron nitride powder 40-80vol%, titanium nitride-titanium oxide mixed powder 57'10% and metallic titanium powder 3-10% is sintered at 1200-1800 degC, and sintering press corresponding to the sintering temp is selected from the press range of the equilibrium press on the phase equilibrium press curve of cubic system boron nitride and hexagonal system boron nitride to 65000kg/cm While applying this sintering press, the mixt is slowly heated and held at the sintering temp for several-10min By this method a cubic system boron nitride solidified body is obtd having high hardness, mechanical strength and toughness, and it is provided with a bond region of three-dimensional network structure