RU1266071C - Method of manufacturing articles from porous composition materials - Google Patents

Description

The invention relates to the field of powder metallurgy, in particular, to methods for producing porous composite materials based on refractory compounds - carbides, borides, metal silicides of i-Vlli groups in the combustion mode.

The aim of the invention is to increase the open porosity.

The invention is illustrated by examples

Example 1 (table Mg 1), 1Lz of titanium, graphite and cobalt powders to prepare a mixture of composition Ti — 75.6 wt.%, C — 19.4 wt.%, Co — 5 wt.%. From the mixture by means of a mold, a cylindrical billet with a diameter of 10 mm, height is pressed. 20 mm, density 2.3 g / cm, From the same mixture pressed igniting tablet density of -2 g / cm. The preform together with the igniting tablet is placed in a D vacuum chamber and their thermal vacuum treatment is carried out at a pressure of 10 mm Hg, st, temperature 600 ° C for 5 minutes. Then, under the conditions of an oakum, the billet is ignited with the aid of the Bolphram spiral and the igniting tablet. The burning rate was 5 mm / s. After cooling in vacuum, a cylinder-shaped product is obtained with the dimensions of the original preform. The density of the product is 2.3 g / cm. The proportion of closed porosity is less than 0.2%, the proportion of open porosity is about 50%,.

Example 1 (table No. 15), a mixture of Ti — 44.6 Maci,%, C-6.1% by weight, B-9, Zmas,%, T1B2-40mys is prepared from titanium, graphite, boron and diboride-titanium powders. ,%, From the mixture with the help of the mold, the billet is pressed into a tube with an outer diameter of 15 mm, an internal diameter of 9 mm and a density of

2.3g / cm. The igniting tablet is pressed from a stoichiometric mixture of titanium with graphite with a density of 2 g / cm. The billet with the burning tablet is placed in a vacuum chamber and subjected to thermal vacuum treatment at a pressure of 104 mm Hg, temperature 700 ° C for 15 minutes. Then, under vacuum, the preform is ignited.

spirally through an igniting tablet. The burning rate is

1.4mm / s After cooling in vacuum, the product is obtained in the form of a tube with the dimensions of the original preform. Product density

2.3 g / cm. The proportion of open porosity is 50%. The metallographic examination of the structure shows that its main components are titanium carbide and titanium diboride. Other examples of the method of obtaining products from porous composite materials based on refractory inorganic compounds with an indication of the initial composition and modes of the process are presented in the table. There are also

data on the manufacture of porous products according to the method prototype.

Thus, the method of obtaining products from porous composite materials on OCHOBS refractory compounds

allows to obtain in the mode of combustion of the product with a porosity of 45-70 May,% of a given shape and size,., with the open character of the pores,

{56) Liebsnson G, L, Production of sintered products, - M ,; Metallurgists, 1982, p., 57-58,

USSR Copyright Certificate № 681658, class, B 22 F 3/26, 1978,

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11126607112

Formula for compression, initiation of combustion, oh. METHOD FOR PRODUCING PRODUCTS FROM A GENERATION THAT IS. what with the purpose

POROUS COMPOSITION MATE-increase open porosity, refractory based on refractory compounds, 5 billet is heated to 500 - 700C

The Scientific Research Institute of Metals IV - Vltl groups, including a pressure of 10–10 mm Hg, Art. 8, the mixing of metal and nonmetal powders, the initiation of combustion and

the product is cooled in vacuum.