Igniter composition

FIELD: chemistry.

SUBSTANCE: invention relates to igniter compositions for electrical igniters. According to the invention, the composition which contains lead chromate, potassium chromate and lead rhodanate, also contains a metal-ceramic powdered composition based on carbides of group IV-VII transition metals, cemented by an iron subgroup metal in amount of 6-25%.

EFFECT: inclusion of a modifying additive into the composition in amount of 1-10%, over 100%, enables to stabilise particle-size composition of the product, increase accuracy of operation of electrical igniters and increase igniting capacity.

3 tbl

 

The invention relates to the field igniter compositions for the igniter.

Known igniter composition consisting of a powder or granular barium azide Ba(N3)2[Patent 2233258, Russia, SW 35/00]. Improving the accuracy of actuation of the igniter based on the igniter composition is achieved due to the nature of the composition, namely the fact that barium azide VA(N3)2is an individual chemical compound. According to the applicant's variation response time products with the use of barium azide is 2.4 MS for nichrome bridge filament, which is approximately 2 times lower than the desired standard value to 4.0 MS (2,0-6,0) MS.

The disadvantages of this structure should be attributed to the low value of safe DC (0.2 a), which does not allow to apply the composition in the products, which increased requirements for safe current.

Known pyrotechnic composition "THE 7276-177-075134-2001. The heat-resistant product for the production of electric spark igniter", resulting in a joint coprecipitation of lead Rodenstock, lead hromovokislyj and potassium perchlorate in the following mass proportions:

Lead chronologicly, %3-7
Cal is th chlorotolyl, %40-46
Lead radamisty, %46-52

The disadvantages of this structure are as follows:

- heterogeneity of particle size distribution soosazhdenie product;

- significant variation in response time due to the heterogeneity of particle size distribution soosazhdenie product.

The technical result is achieved by the fact that during coprecipitation of pyrotechnic composition THAT 7276-177-075134-2001 introduced cermet powder composition based on carbides of transition metals of IV-VII groups, cemented metal of the iron subgroup from 6 to 25%, in an amount of from 1 to 10% above 100% (hereinafter modifying agent).

The technical result of the invention, the igniter composition for igniter lead chronologicly, potassium chlorotolyl, lead radamisty, characterized in that it contains cermet powder composition based on carbides of transition metals of IV-VII groups, cemented metal of the iron subgroup from 6 to 25%, in an amount of from 1 to 10% above 100%.

The introduction of the modifying additives allows to stabilize the particle size of the product soosazhdenie, to increase the accuracy of operation and to increase the igniting ability of the igniter.

P the results of the testing and comparison of known and proposed composition are provided later.

As you know, the igniter compositions are required by the homogeneity of the distribution of components in volume. If the igniter compositions of mechanical mixture, the homogeneous distribution is achieved by thorough mixing of the components of high dispersion. If the components of the composition are formed during the synthesis process, it becomes possible to control the shape of the crystals in order to give them a more correct form. Benchmark the correct form of the crystals is of spherical form, in which the ratio of the two dimensions (height and length) h/D is equal to unity. Crystals of spherical shape have a minimum area of contact with other crystals, thereby reducing the possibility of friction between them. This, in turn, positively affects a uniform distribution of components in volume, reduces conquest, caking of the product on a vacuum funnel, and also improves the stability of the suspension of the product in the lacquer.

To characterize the shape of the crystals was measured linear dimensions of the crystals with an accuracy of up to 0.01 mm by means of a ruler of an optical microscope. The measurements were carried out in 9 crystals each deposition for each type of crystals (1 type - spherical shape, type 2 - needle form).

The influence of modifying additives on the particle size distribution is left is given in table 1.

Table 1
Granulometric composition
The igniter compositionThe ratio h/DMass fraction of crystals after sieve No. 61 %
1 type crystals (spherical)type 2 crystals (needle)
THE 7276-177-075134-20010,520,1494,81
Offered with 1% modifying additivesof 0.77 and 0.680,35-0,3094,62
We offer 10% modifying additives0,81-0,730,34-0,2993,10

As follows from table 1, the proposed composition of the average value of the ratio h/D in type 1 crystals is(0,77+0,68+0,81+0,73)/4=0,75, as for the composition of THE 7276-177-075134-2001 this ratio is equal to 0.52 in.

Thus the introduction of modifying additives improves the shape of the crystals, and the rate of h/D increases 1.44 times or 44%.

Than the ranks of changes happen with needle-like crystals form, in which the ratio h/D (0.32, i.e. increases to 2.28 times, or 128%. Summing up we can say that the modifying additive significantly improves the shape of the crystals closer to correct.

The particle size distribution of the offered product has a high, more than 90%mass fraction fraction after sieve No. 61, which provides a uniform and stable distribution of the compounds in the lacquer.

Therefore, the proposed formulations are the best indicators of granulometric composition compared to the composition of THE 7276-177-075134-2001.

Parameter time delay electric igniter (EV) is very important, because the response time EV affect the overall response time of the detonator. The response time EV should be in the range (2-6) MS. The stability and accuracy of response EV will depend on the homogeneity of the igniter composition, and as was shown above, the uniformity of the proposed composition of the above due to the stabilization of particle size distribution. Evidence of this are the test data EV made on the basis of the compositions of THE 7276-177-075134-2001 and offer with nichrome bridge incandescent.

Accuracy assessment of the operation of EV were carried out by finding the arithmetic mean value x, the amplitude R and the standard deviation S. the test Results is given in table 2.

Table 2
Response accuracy EV
The igniter compositionThe arithmetic mean value x, MSThe standard deviation S, MSThe scale R, MS
THE 7276-177-075134-2001of 3.461,153,40
Offered with 1% modifying additives3,09-3,82of 0.21 to 0.390,65-1,13
We offer 10% modifying additives2,98-3,520,34-0,720,98-2,40

In accordance with the requirements of acceptable change limits response time EV are: the lower boundary of the tolerance is 2 MS, the upper bound is 6 MS. The nominal value of the response time - 4 MS. As shown by the data in table 2, the composition of THE 7276-177-075134-2001 has a large variation in response time (R=3,40 MS), and with an average value of 3.46 MS response time EV can be 6,86 MS, which exceeds the permissible value. Here again Prowse is by the influence of the inhomogeneity of the particle size distribution. If the composition on the basis of barium azide scale (in the case of nichrome bridge) is 2.4 MS, the composition of THE 7276-177-075134-2001 scale increases to 3.4 MS.

In the proposed composition of the magnitude of is (0,65-2,40) MS, which is at the level of individual chemical compounds as barium azide, and even surpasses it, not to mention the composition of THE 7276-177-075134-2001.

A good example of the superiority of the operational characteristics of the proposed structure (in the parameter "time delay") is the standard deviation S, which characterizes the dispersion time expires EV around the average value.

As can be seen from table 2, the standard deviation for the composition of THE 7276-177-075134-2001 is 1,15 MS, and the proposed composition of this value is significantly smaller and is only (0,21-0,72) MS.

The statistical evaluation time expires EV confirms the superiority of the proposed composition of the above composition THE 7276-177-075134-2001.

The most important characteristic of EV is initiating ability, which is characterized by igniting capacity, i.e. the ability to initiate the next element in the chain of initiation.

Igniting ability of the compounds was characterized by the probability of ignition of trinitroresorcinate lead (CNRS), pressed under a pressure of 500 is g/cm 2located at a distance of 30 cm from the EV. The beam of fire was spreading through the channel, causing an explosion or failure TNRS. The number of parallel tests 10. The results flammable abilities EV made on the basis of known and proposed formulations are shown in table 3.

Table 3
Igniting ability of the compositions
The igniter compositionThe probability of ignition %
THE 7276-177-075134-200160
Offered with 1% modifying additives70
We offer 10% modifying additives90

Thus, the proposed composition is more, compared with the composition of THE 7276-177-075134-2001, igniting capacity.

The igniter composition for igniter lead-containing chromic acid, potassium chloride acid, lead radamisty, characterized in that it contains cermet powder composition based on carbides of transition metals of IV-VII groups, cemented metal of the iron subgroup from 6 to 25%, in the amount of the t 1 to 10% above 100%.



 

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