DE969139C - Impact and friction pyrophoric alloys - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

ISSUED MAY 8, 1958

GERMAN PATENT OFFICE

PATENT LETTERING

JVr. 969 139 CLASS 78f GROUP INTERNAT. CLASS C 06 c

T 9017IVa I'7Sf

Dr. Hans Nowotny, Vienna, Dr. Otto Smetana, Treibach, Carinthia, and Dr. Kurt Komarek, Vienna (Austria)

have been named as inventors

Treibacher Chemische Werke Aktiengesellschaft, Treibach, Carinthia (Austria)

Impact and friction pyrophoric alloys

Patented in the territory of the Federal Republic of Germany on February 10, 1954

Patent application published March 8, 1956

Patent issued on April 24, 1968

The priority of the application in Austria of February 26, 1953 has been claimed

There are metals and alloys that are impact and friction pyrophoric, i. H. when hitting, rubbing, Files and the like give sparks. In order for such an alloy to be technically usable, it must S sparks be hot enough and remain hot long enough to respond to suitable substances, in particular flammable gases as well as liquid or solid flammable substances to have an igniting effect. The pyrophoricity must be easy to excite at any time, the consumption of ίο pyrophoric metal during spark formation should be low be. The pyrophoric metal must be sufficient to withstand the corrosive influences that occur during normal use long resist.

So far, only a few metals and alloys are known that meet all of these requirements. In practice, therefore, alloys containing cerium have hitherto been used exclusively as ignition metals.

The invention extends the series of impact and friction pyrophoric alloys by a new group of such alloys. This invention

Alloys are characterized in that, in addition to 25 to 80 ° / ₀ Sb and / or Bi, they also contain Ti and / or Zr and are in the ABCDEA field of the diagram. The placarding of inventive alloys that are entirely free of Ti is, however, not very pronounced, but the placarding of the titanium-free alloys is beautiful, greatly increased by small titanium additives, for example 5 ° / _0th It should also be noted that there is an area of good corrosion resistance within the ABCDEA area, which is characterized by the ABCHGFEA area. The GH segment corresponds to a Ti content of 25 percent by weight, the FG segment to an Sb content of 60 percent by weight. In addition to the elements Sb and Bi, the alloys can contain one or more of the following elements:

a) in a total amount not exceeding 15%: Th, U, rare earth metals, P, Sn, As; b) in a total amount not exceeding 10%: Zr, Fe, Co, Ni, Mn, Al, Si, Cu, Ag, V, Ce, Mo, W. These elements are used as alloy additives in pyrophores Known to the masses.

Furthermore, elements can be present in the alloys which are present as impurities in the alloy components (for example the titanium metal) or which can be added during the production or processing of the alloys. These are the elements O, H, C, S, P, N. The use of titanium as a component of pyrophoric alloys is known per se, but earlier titanium was only used as an additive to such alloys, which mainly consist of rare metals Earth exist. Pyrophoric alloy rods with a Ti content ranging between 1.5 and Ig ⁰ I ₀ have been proposed; the remainder must consist essentially of rare earth metals. In contrast, the main components of the alloy according to the invention are Sb and / or Bi and Ti and / or Zr. The alloys can even rare earths (but need not), and if these additives are present, their share will never exceed I5 ° / _O.

According to another proposal, the pyrophoric alloys, consisting of partially oxidized or partially nitrided rare earth metals, as well as many other metals, Ti, Zr, Sb and Bi mentioned as possible additives. These additives are small in terms of quantity; by far predominant The main components of the alloys are the partially oxidized rare earths.

Canadian patent 475 i73 are pyrophoric alloys with 20 to 75 percent by weight lead and 25 to 80 percent by weight zirconium and 5 to 40 percent by weight titanium has become known. These alloys can be used as diluents also contain antimony, preferably in combination with manganese. In the alloy examples of the patent mentioned some such antimony-containing alloys are listed. Since the antimony in these Examples were added with at least nine times the amount of manganese, the antimony content

not be big; it is given with a maximum of 4 ° / o. But also with the only alloy containing manganese-free antimony, which the patent indicates, the antimony content is only 2 percent by weight. Obviously there is only one slight addition of antimony has been thought, whereas with the alloys according to the present invention Invention the antimony content is at least 25 percent by weight. There is an addition of bismuth not mentioned at all in the Canadian patent specification. It is also noticeable that none of the Canadian patent specification contains titanium and antimony at the same time. This also applies to Canadian patent specification 475 172, which is also made with a pyrophoric alloy similar to that in the former Canadian Patent treated busy. It follows that the said Canadian patents pyrophoric bodies from the Ti-Zr-antimony (bismuth) system are foreign. But such bodies are Subject of the present invention.

The alloys according to the invention can be produced in various ways. The following embodiment explains such a generation path:

200 g titanium powder with 99 ° / “Ti are pressed with 100 g zirconium powder (91 ° / ₀ ) and 700 g antimony powder in a hydraulic press without adding a binder to give pastilles 30 mm in diameter and 30 mm in height. 500 g of these pellets are used in a cylindrical crucible of dense graphite with the dimensions "48 mm inner diameter, 60 mm outer diameter and 300 mm _m length in a tiltable, closed on all sides carbon tube short-circuit furnace. The furnace chamber was evacuated to 0.05 mm Hg, is pure argon up to a pressure of 700 mm Hg admitted and the current _iO o switched on. the current is initially 200 a and is increased in the course of 10 minutes, gradually to the final value of 500 a, the final voltage is 27 V. After 13 minutes, the mass melted. The pressure in the furnace rises to 1400 mm Hg. It takes another 25 minutes to melt the remaining pastilles, which are gradually added to the melt using a suitable device the mold, which has been heated to 500 ^{0 and is} attached to the lid of the furnace, flows

Embodiments:

Weight percent Sb Bi Ti Zr

Claims (4)

PATENT CLAIMS: i. Impact and friction pyrophoric alloys, especially for flints, characterized by I. 40 - 50 IO 2. 60 - 30th IO 3 · 40 - 40 20th A- - 75 15th IO S- - 30th IO 60 6th 60 - 2 38 · shows that in addition to 25 to 80 ° / ₀ Sb and / or Bi they also contain Ti and / or Zr and lie in the field ABCDEA of the diagram of the drawing. 2. Alloys according to claim 1, characterized by a position in the ABCHGFEA area of the diagram. 3. Alloys according to one of claims 1 or 2, characterized by the presence of one or more of the elements Th, U, rare earth metals, P, As and Sn in a total amount of at most 15 ' ⁰ / ». 4. Alloys according to one of claims 1 to 3, characterized in that they further elements known as alloy components for pyrophoric masses in a 10 weight percent not exceeding the total amount included. Considered publications: German Patent Specifications No. 215695, 224231; British Patent Nos. 27,341/1908, 829/1909; U.S. Patent No. 1,023,208; Canadian patents nos. 475 172, 475 173. For this purpose ι sheet of drawings © 5p9 696/104 2. (809 504/3 4.5 «)