SU1746269A1 - Method of analysis of composite materials - Google Patents

Description

Since the components are scattered from the background by approximating the latter by linear dependence, it should be noted that this procedure is, in principle, not sufficiently substantiated and has a somewhat arbitrary character, which, in turn, reduces the reliability of the data obtained.

The main disadvantage of the known method is that it also has low reliability and accuracy in the analysis of composite materials having an amorphous structure, where, as is well known, there are only diffuse maxima with a large half-width and a wide range of angles is necessary to measure.

The aim of the invention is to improve the accuracy of determining the content of components in composite materials with small differences in the molecular compositions of the components of the material under study and one-way access.

The use of the invention allows a more reliable and accurate analysis of the components in composite materials, which increases the reliability of the results of structural calculations using these materials in them. In addition, using this method it is possible to carry out analysis control on products of any dimensions, which allows to reduce the cost of conducting quality control of products made of composite materials.

This goal is achieved by the fact that, in a known method, consisting in the irradiation of a controlled object and samples by comparing x-rays at an angle to the controlled surface of the object and measuring the integrated intensity of scattered radiation at an angle of 2 9 to the primary beam, the conditions for measuring defined by the new expression.

The irradiation of the object's controlled surface is carried out at an angle of 0, then the integral intensity of the scattered radiation is measured in the range of angles 2 in from 8 to 60 °, and the comparison samples are made from the initial components of the composite material of the same batch, then the material of the object being monitored.

The content of the matrix material is calculated from

BUT

I - 1СВ8

Jap ice

where I, 1cb, and lap are the intensities of the diffracted x-rays, respectively, on samples of the composite material under investigation, the polymerized binder, and the matrix material.

A new method of calculating the content of components is based on the assumption of a linear dependence of the integral scattering intensity on the phase composition. For composite materials (granoplasts) made from different batches of raw materials, linear dependencies have a different character, which can be explained by the diversity of composite materials, manufacturing technology, etc. factors

(figure 1).

The choice of the irradiation angle interval 2 in 8-60 ° is due to the fact that the maximum distribution of the intensity of x-ray radiation scattered by the composite

materials contained in the angular ranges corresponding to the diffuse maxima of the components.

It has been established experimentally (Fig. 2) that many composite materials with irradiation angles less than 8 ° (2 to 8 °) are significantly affected by illumination from the primary beam, which reduces the measurement accuracy. Starting from an irradiation angle of 6 ° (2 to 60 °), the intensity of the x-ray scatter practically does not exceed the background.

Fig. 1 shows the dependence of the integral x-ray scattering intensity (in the range of angles 2 in 8-60 °) on a composite material.

from the volume content of the filler, where 1-3 are the numbers of the compositions of binders and fillers of different batches, in Figure 2 - diffractograms of 4-6 organoflonit, unidirectional organoplastic and sample of polymerized binder EDT-10, respectively.

The invention is as follows. On the axis of rotation of the x-ray goniometer

The analyzed object is made of a composite material, a sample of a cured matrix material and a filler sample close to 100% filling (for example, for organoplastics - organofiber, made from the fiber of the same batch as the composite, and for carbon-fiber plastic - a graphite plate, for fiberglass - glass, etc.). On the one hand, the goniometer sets the X-ray

the tube, and the flow of rays from the tube is directed to the controlled material. The angle of incidence of the rays is chosen in the range of 4-5 °. On the other side of the goniometer, install the sensor so that its angle

the speed was 2 times the angular velocity of rotation of the goniometer axis. The sensor registers the diffracted X-rays in series on samples of composites of the material, filler and matrix material in the range of an angle of 2 to 8-60 °.

After obtaining the intensity data of the diffracted X-ray radiation, the content of the filler is determined by the expression:

I -I

ev

ar

ev

where I, ICB, lap are the above measurements, respectively, on the controlled composite material (in the sample or article), on the samples of the polymerized binder and matrix material. Comparison samples are made from each of the starting components of the composite material separately.

Claims (1)

Claims The method of controlling the content of components in composite materials, in which an X-ray beam at an angle 0 measures the integral intensity of the scattering at an angle of 2 ° to the primary beam at an angle 0, in order to increase accuracy with close molecular compositions of the components of the material under study and one-way access to the sample, measurement of the scattering is carried out in the range of angles 2 0 8-60 °, standards are made t of the starting components of the composite material of the same batch as the examined object and the content of the components was determined from the expression: d- ev II  ar ev 0 where A is the content of the matrix material; I, ICB and lap are the diffracted x-ray intensities, respectively, on samples of the composite material under investigation, the polymerized binder, and the matrix material. 0 five (by) ISO to 40О -z SO 20 20 40 And W. in & 0 yo 3 ".G 9e 60 ° 29 ( Fng.2