FIELD OF INVENTION
This invention relates to a pyrotechnic delay composition.
PRIOR ART
Pyrotechnic delay composition are used in armament store like fuzes, grenades etc. Generally used pyrotechnic delay compositions contain fuels such as tungsten, sulphur, antimony sulphide, zirconium etc. The oxidisers used are mainly potassium perchlorate, barium nitrate, barium chromate, potassium nitrate etc and the binder is mainly nitrocelluslore.
The disadvantage of these known delay compositions is that they product more gas.
Another disadvantage of these known delay composition is that they are fast burning.
Yet another disadvantage of these known delay composition is that they do not burn in small column diameter.
Still another disadvantage of these known delay compositions is that they leave no slag on burning.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a low gas producing delay composition.
Another object of the present invention is to provide a low gas producing delay composition which can burn in a column of 4mm diameter.
Yet another object of the present invention is to provide a low gas producing delay composition which will give a delay time of more than 8 sec per centimeter.
Still another object of the present invention is to provide a low gas producing delay composition which will function in wide range of temperature of-40° C to 60°C.
Further main object of the present inventon is to provide a low gas producing delay composition which is less sensitive to impact and friction.
Yet further object of the present invention is to provide a low gas producing delay composition which is composed of ingredients which are cheap and readily available,
STATEMENT OF INVENTION
According to this invention there is provided a pyrotechnic delay composition comprising 3 to 7% by weight of titanium metal powder, 70 to 80% by weight of barium chromate, 5 to 15% by weight of potassium perchlorate, 1 to 5% by weight of calcium oxalate monohydrate, 2 to 5% of sulphur and 0.5 to 1.5% of nitrocellulose.
DESCRIPTION OF THE INVENTION
The pyrotechnic delay compositon of the present invention is prepared by mixing
titanium metal powder ( particle size 4 to 5µ) in preferred quantity of 3 to 7%, Barium
chromate (0.6 to 0.8µ) in preferred quantity of 70 to 80%, potassium perchlorate
(125 µ/63µ IS sieve) in preferred quantity of 5 to 5%, calcium oxalate monohydrate (1.7)4,
in preferred quantity of 1 to 5%, sulphur, (passing 63µ IS sieve) in
preferred quantity of 2 to 5% and nitrocellulose (from APC-217) in preferred quantity of 0.5 to 1.5%.
It is to be understood that the composition of the present invention possesses properties different from the constituents and does not merely involve aggregation of properties.
The inverse burning rate in lead fuze of all the ingredients of the pyrotechnic delay composition is less than 8 s/cm, whereas the inverse burning rate in lead fuze of the composition is more than 7 to 8 s/cm. Hence, the composition exhibits synergism. Further, there is no chemical reaction involved in the process of preparation of the composition.
WORKING EXAMPLE
For preparation of 100 gms of the pyrotechnic delay composition ingredients mixed are 5 gms of titanium metal powder of particle size 4 to 5|j, 76gms barium chromate of particle size 0.6 to 0.8 µ, 10 gms of potassium perchlorate (125u / 63µ IS sieve), 3 gms of calcium oxalate monohydrate, 2 gms of (G I) sulphur (63µ IS sieve) and 1 gm of nitrocellulose from APC- 317
The composition containing 5% Titanium, 10% potassium perchlorate, 76% barium chromate, 3 calcium oxalate, 2% sulphur, 1% nitrocellulose is characterized by parameters lised in Table- 1:
TABLE -1
CHARACTERISTICS OF COMPOSITION OF PRESENT NVENTION
(TABLE REMOVED)
It is to be noted that by changing proportions of sulphur and calcium oxalate, it is possible through the present invention to get a family of reliable low gas producing pyroteclmic delay compositions with a burning rate in the range of 5 to 11 s/cm.
It is to be understood that the composition of the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such modifications, adaptations, changes are intended to be within the scope of the present invention, which is further set forth under the following claims:-

CLAIM
1. A pyrotechnic delay composition comprising 3 to 7% by weight of titanium metal powder, 70 to 80% by weight of barium chromate, 5 to 15% by weight of potassium perchlorate, 1 to 5% by weight of calcium oxalate monohydrate, 2 to 5% of sulphur and 0.5 to 1.5% of nitrocellulose.
2. A composition as claimed in claim 1 wherein titanium metal powder has particle size between 4 to 5 microns.
3. A composition as claimed in claim 1 wherein Barium chromate powder has particle size between 0.6 to 0.8 microns.
4. A composition as claimed in claim 1 wherein potassium perechlorate powder is sieved through 63 micron sieve.
5. A composition as claimed in claim 1 wherein sulphur powder is sieved through 63 micron sieve.
6. A pyrotechnic delay composition as substantially herewith described with reference to example.