CN113267148B - Nondestructive testing method for coating thickness of insensitive transmitting explosive package - Google Patents

Nondestructive testing method for coating thickness of insensitive transmitting explosive package Download PDF

Info

Publication number
CN113267148B
CN113267148B CN202110460313.5A CN202110460313A CN113267148B CN 113267148 B CN113267148 B CN 113267148B CN 202110460313 A CN202110460313 A CN 202110460313A CN 113267148 B CN113267148 B CN 113267148B
Authority
CN
China
Prior art keywords
sectional
hole
coating
thickness
sampling points
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110460313.5A
Other languages
Chinese (zh)
Other versions
CN113267148A (en
Inventor
徐敏
朱勇
赵娟
王�锋
宁艳利
周文静
刘可
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Modern Chemistry Research Institute
Original Assignee
Xian Modern Chemistry Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Modern Chemistry Research Institute filed Critical Xian Modern Chemistry Research Institute
Priority to CN202110460313.5A priority Critical patent/CN113267148B/en
Publication of CN113267148A publication Critical patent/CN113267148A/en
Application granted granted Critical
Publication of CN113267148B publication Critical patent/CN113267148B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
    • G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

The invention relates to a nondestructive testing method for the thickness of a coating of an insensitive transmitting explosive package, which comprises the following steps: step one, obtaining two-dimensional DR data of a insensitive propellant powder column; step two, obtaining a CT sectional view of the grain; carrying out surface treatment and contrast adjustment on the obtained CT sectional view; selecting one or two CT sectional views from all the CT sectional views in the XY direction, and selecting a plurality of sampling points for the selected CT sectional views; selecting two section graphs along the diameter direction from the XZ section graphs or all the CT section graphs in the YZ direction, and arranging a plurality of sampling points; and step five, measuring the thickness of the coating layer on each sampling point of the layout, and calculating to obtain the average value and the distribution range of the thickness of the coating layer of the insensitive propellant powder. The invention solves the technical problem of the nondestructive testing method for the thickness of the coating of the insensitive propellant powder, thereby providing a basis for the correlation research of the coating process parameters of the insensitive propellant powder, the thickness of the coating and the combustion increment.

Description

Nondestructive testing method for coating thickness of insensitive transmitting explosive package
Technical Field
The invention belongs to the field of passive emission pharmacological analysis and detection, and particularly relates to a method for detecting the thickness of a coating of a passive emission medicine package.
Background
The propellant charge is used as the energy source for the barrel weapon, and the particle structure of the propellant charge is an important factor influencing the charge and combustion performance of the propellant charge. The surface insensitive coating of the propellant charge may improve the combustion increasability and safety of the propellant charge.
Desensitization coated propellants, such as four-hole, seven-hole, and nineteen-hole desensitization propellants, have been used in the model. The thickness of the coating layer is an important parameter of initial combustion violence and combustion increaseability, and plays a role in regulating and controlling high-loading density combustibility. For the characterization of the thickness of the insensitive layer, the ballistic performance of the propellant powder is indirectly characterized, and parameters such as burning time, burning pressure, chamber pressure, initial speed and the like of the propellant powder are measured mainly by adopting a closed explosive device experiment and an inner ballistic experiment to indirectly evaluate the insensitive effect; the second is the process which is indirectly characterized by the feeding amount, and the quality change of the propellant before and after the insensitive effect is in direct proportion to the insensitive thickness of the insensitive agent determined by the shape of the propellant. Characterization of these macroscopic or process parameters cannot replace quality inspection indicators.
The Wang Zenshan academy team adopts a microscope to measure the insensitive layer thickness of the low-temperature insensitive gunpowder manufactured by the two processes. Taking a certain amount of insensitive propellant powder out of the sample, putting the sample into a water area oven with the temperature of 353K for baking for at least 30 minutes, then cutting, measuring the insensitive layer thickness of the propellant powder by using a measuring microscope, measuring 12 times in each measurement, and taking the average value as the insensitive layer thickness of the propellant powder. For the thickness measurement in the cross section direction, the microscope test needs to smooth the surface of the sample, and for the thickness measurement in the longitudinal section direction, the cutting process needs to be performed. The cross section and the longitudinal section cannot be completed in one measurement, and both require pretreatment of the sample.
Disclosure of Invention
According to the invention, the cross section and longitudinal section images of the insensitive coated propellant powder can be obtained through a micro-focus X-ray computer tomography (micro-focus CT) analysis technology without sample pretreatment and only one-time imaging analysis, and the thickness and thickness distribution data of the coating layer are obtained according to the drug shape layout sampling points in the two-dimensional section images in two directions.
The technical problem to be solved by the invention is to provide a nondestructive testing method for the coating thickness of a insensitive coated propellant powder package, which obtains the internal structure of the insensitive coated propellant powder in situ by a micro-focus CT technology, reasonably arranges test points in two-dimensional section images in two directions, and measures the coating thickness at the test points, thereby obtaining the average coating thickness and the coating distribution range of the insensitive coated propellant powder, providing an important physicochemical parameter for the initial combustion violence and the combustion increment of the propellant powder, and providing a basis for the research of a coating process and a coating effect.
In order to achieve the purpose, the invention adopts the following technical scheme to solve the problem:
a nondestructive testing method for the thickness of a coating of an insensitive emission medicine package specifically comprises the following steps:
placing a to-be-detected insensitive emission drug column into the center of a sample table of a micro-focus CT device, and acquiring two-dimensional DR data of the insensitive emission drug column by a detector in a micro-focus cone beam mode;
step two, performing three-dimensional CT reconstruction on the two-dimensional DR data obtained in the step one to obtain a three-dimensional CT reconstruction image of the explosive column and a CT sectional image of the coating interface in XY direction and XZ direction or YZ direction; respectively carrying out surface treatment and contrast adjustment on the obtained CT sectional view;
selecting one or two CT sectional views from all the CT sectional views in the XY direction, and selecting a plurality of sampling points for the selected CT sectional views;
step four, selecting two section diagrams along the diameter direction from all CT section diagrams in the XZ direction, or selecting two section diagrams along the diameter direction from all CT section diagrams in the YZ direction, and respectively arranging a plurality of sampling points on the two selected section diagrams;
measuring the thickness of the coating layer on each sampling point of the layout, and taking the average value of the measurement results as the measured value of the thickness of the coating layer of the corresponding sampling point; the average value of the coating thickness of all the sampling points is obtained as the average value of the coating thickness of the insensitive propellant powder.
Furthermore, in the first step, the voltage of the X-ray tube is set to be 40 KV-100KV, the power of the X-ray target is set to be 2W-7W, the amplification factor is 3-30, and the number of the detector frames is 0.8 Hz-2.0 Hz.
Further, in the first step:
for the four-hole explosive column, setting the voltage of an X-ray tube to be 40 KV-80KV, the power of an X-ray target to be 2W-5W, the magnification to be 20-30 and the number of detector frames to be 0.8-1.8 Hz;
for the seven-hole explosive column, setting the voltage of an X-ray tube to be 50 KV-90KV, the power of an X-ray target to be 3W-6W, the amplification factor to be 6-15 and the number of detector frames to be 0.8-1.8 Hz;
for the nineteen-hole grain, the voltage of an X-ray tube is set to be 60 KV-100KV, the power of an X-ray target is set to be 4W-7W, the magnification is set to be 3-10, and the number of frames of a detector is set to be 1.0-2.0 Hz.
Further, in the first step, the contrast adjustment is to adjust the gray scale and transparency of the CT sectional image by adjusting the iso-surface to be located between two peaks and the start point of the interval.
Further, in the third step, a CT sectional view and sampling points are selected and determined according to the type of the grain to be detected:
for the four-hole grain, selecting a section diagram at the height 1/2 of the grain from all CT section diagrams in the XY direction, and arranging 8 sampling points on the section diagram;
for the seven-hole and nineteen-hole drug columns, the section diagrams at the 1/3 and 2/3 positions of the height of the drug column are respectively selected from all CT section diagrams in the XY direction, and 6 sampling points are respectively arranged on the two selected section diagrams.
Further, in the third step, the method for selecting the sampling point specifically comprises the following steps:
for a four-hole grain, the sampling point position setting method is as follows: horizontally placing one side of the selected section diagram, setting four straight lines with equal angle intervals on the section diagram, wherein 8 intersection points of the four straight lines and the boundary of the explosive column on the section diagram are sampling points;
the position setting method of the seven-hole grain sampling point comprises the following steps: on the first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the medicine column, and 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points; on the second CT sectional view, integrally rotating three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view by 30 degrees, wherein 6 intersection points of the three straight lines and the boundary of the drug column on the sectional view are sampling points;
the method for setting sampling point positions of nineteen-hole grains comprises the following steps: on the first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the explosive column and at the edge of the explosive column, and 6 intersection points of the three straight lines and the boundary of the explosive column on the sectional view are sampling points; on the second CT sectional view, three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view are integrally rotated by 30 degrees, and at the moment, 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points.
Further, in the fourth step, the CT sectional view and the number of the selected sampling points are determined according to the type of the drug column to be detected:
for the four-hole grain, two selected section views are respectively the section views which cross the two holes along the diameter direction and the YZ direction without holes; for the seven-hole grain, two selected section pictures are respectively the section pictures in the YZ direction which transversely passes through the three holes and one hole along the diameter direction; for a nineteen-hole grain, two section views are taken in the XZ direction across five holes and three holes along the diameter direction.
Further, in the fourth step, for the four-hole grain, the seven-hole grain and the nineteen-hole grain, the method for respectively arranging 6 sampling points on the two selected CT sectional views is the same: and respectively arranging sampling points at two end points of two vertical edges and the middle point of the two end points on each section.
Further, in the fifth step, the measurement of the sampling points is performed by adopting a caliper mode in a software measurement mode, and each sampling point is measured for 6 times.
The invention has the beneficial effects that:
the micro-focus CT adopted by the invention can obtain clear interface structure images of the blunt-coated propellant powder column and the coating layer, thereby accurately measuring the thickness of the coating layer.
The method combines the structural characteristics of the insensitive coated propellant powder, selects one or two CT sectional views with cross sections from all the CT sectional views in the XY direction, and selects 6 or 8 sampling points for the selected CT sectional views; selecting two longitudinal section sectional diagrams along the diameter direction from all CT sectional diagrams in the XZ or YZ direction, and respectively arranging 6 sampling points on the selected two sectional diagrams; the method obtains 20 or 24 sampling points in total, solves the problem that single-point measurement is not representative due to uneven thickness of the cladding layer, and well realizes balance between the measurement working efficiency and the accuracy of the final calculation result, wherein the measurement working efficiency is influenced by the number of the sampling points.
For the four-hole grain, 8 sampling points are distributed on the section diagram in the XY direction at the position of 1/2 of the height of the grain in the XY direction, 6 sampling points are distributed on two section diagrams which cross five holes and three holes in the diameter direction from the YZ direction, and the total number of the sampling points is 20; for a seven-hole grain, 6 sampling points are respectively laid out from two section pictures in XY directions at the positions of 1/3 and 2/3 of the height of the grain in XY directions in two modes of traversing three holes and traversing one hole, 6 sampling points are respectively laid out from two section pictures traversing three holes and traversing one hole in YZ directions along the diameter direction, and 24 sampling points are totally adopted; for a nineteen-hole grain, 6 sampling points are respectively arranged in two cross-sectional diagrams in the XY direction at the positions of 1/3 and 2/3 of the height of the grain in the XY direction in a mode of traversing five holes and three holes, 6 sampling points are respectively arranged in two cross-sectional diagrams which traverse five holes and three holes in the diameter direction in the XZ direction, and 24 sampling points are arranged in total; under the condition of more precise layout of the sampling points, the final measurement and calculation result can better cover each area range of the grain, and the thickness of the coating layer can be more accurately represented.
And (IV) the average value and the distribution range of the coating layer thickness of the explosive column are obtained by adopting a micro-focus CT technology and combining reasonable sampling point layout and measuring the coating layer thickness of each sampling point, so that the technical problem of the absence of a non-destructive detection method for the coating layer thickness of the insensitive coated transmitting explosive is solved.
Drawings
FIG. 1 is a schematic diagram showing the layout of sampling points in a CT sectional view of four-hole columns in XY directions.
FIG. 2 is a schematic diagram showing the layout of sampling points of two CT sectional views taken in XY directions by a seven-hole column. Wherein, (a) and (b) are the layout of sampling points on two CT sectional graphs respectively.
FIG. 3 is a schematic diagram showing the layout of sampling points of two CT sectional views taken in XY directions for nineteen-hole grains. Wherein, (a) and (b) are the layout of sampling points on two CT sectional views respectively.
FIG. 4 is a schematic view showing the layout of sampling points of two CT sectional views taken in YZ direction by four-hole columns. Wherein, (a) and (b) are the layout of sampling points on two CT sectional views respectively.
FIG. 5 is a schematic view showing the layout of sampling points of two CT sectional views taken in YZ direction by the seven-hole column. Wherein, (a) and (b) are the layout of sampling points on two CT sectional views respectively.
FIG. 6 is a schematic diagram showing the layout of sampling points of two CT sectional views taken in the XZ direction by nineteen-hole grains. Wherein, (a) and (b) are the layout of sampling points on two CT sectional graphs respectively.
FIG. 7 is a partial enlarged sectional view of the interface between the four-hole desensitized coated propellant charge and the coating of example 1. Wherein (a) is a partial enlarged view of a sectional view in XY directions, and (b) is a partial enlarged view of a sectional view in YZ directions.
FIG. 8 is a measurement diagram of 8 sampling points in an XY-direction sectional view of the four-hole desensitized cladding propellant powder of example 1.
FIGS. 9 and 10 are measurement diagrams of 6 sampling points in two YZ-direction cross-sectional views of the four-well desensitized encapsulating propellant of example 1.
FIG. 11 is a partially enlarged cross-sectional view of the interface between the seven-hole desensitized coated propellant charge and the coating of example 2. Wherein (a) is a partial enlarged view of a cross-sectional view in XY directions, and (b) is a partial enlarged view of a cross-sectional view in YZ directions.
FIGS. 12 and 13 are measurement diagrams of 6 sampling points in two XY-direction cross-sectional views of the seven-hole desensitization coating propellant powder of example 2.
FIGS. 14 and 15 are measurement diagrams of 6 sampling points in two YZ sectional views of the seven-hole desensitized covering propellant of example 2.
FIG. 16 is an enlarged partial XY-direction cross-sectional view of the nineteen-hole desensitized coated propellant grain and coating interface in example 3. Wherein, (a) is a partial enlarged view of a cross-sectional view in the XY direction, and (b) is a partial enlarged view of a cross-sectional view in the XZ direction.
FIGS. 17 and 18 are measurement diagrams of 6 sampling points in two XY sectional views of the nineteen-hole desensitization coating propellant in example 3.
Fig. 19 and 20 are measurement diagrams of 6 sampling points in two XZ-direction sectional views of the nineteen-hole desensitized coating propellant powder in example 3.
The invention is further explained below with reference to the figures and examples.
Detailed Description
The invention provides a nondestructive testing method for the thickness of a coating of an insensitive emission cartridge, which comprises the following steps:
placing a to-be-detected insensitive emission drug column into the center of a sample table of a micro-focus CT device, and acquiring two-dimensional DR data of the insensitive emission drug column by a detector in a micro-focus cone beam mode;
preferably, the voltage of the X-ray tube is set to be 40 KV-100KV, the power of the X-ray target is set to be 2W-7W, the amplification factor (namely the proportion of FDD and FOD) is 3-30, and the frame number of the detector is 0.8 Hz-2.0 Hz;
preferably, for the four-hole explosive column, the voltage of an X-ray tube is set to be 40 KV-80KV, the power of an X-ray target is set to be 2W-5W, the magnification is set to be 20-30, and the number of frames of a detector is set to be 0.8-1.8 Hz;
for the seven-hole explosive column, setting the voltage of an X-ray tube to be 50 KV-90KV, the power of an X-ray target to be 3W-6W, the amplification factor to be 6-15 and the number of detector frames to be 0.8-1.8 Hz;
for the nineteen-hole grain, the voltage of an X-ray tube is set to be 60 KV-100KV, the power of an X-ray target is set to be 4W-7W, the magnification is set to be 3-10, and the number of frames of a detector is set to be 1.0-2.0 Hz.
Step two, performing three-dimensional CT reconstruction on the two-dimensional DR data obtained in the step one to obtain a three-dimensional CT reconstruction image of the grain and a CT sectional image of the coating interface in XY direction, XZ direction or YZ direction; and respectively carrying out surface treatment and contrast adjustment on the obtained CT sectional view to ensure that the surface interfaces of the grain and the coating layer are clear.
Preferably, the contrast adjustment is to adjust the gray scale and transparency of the CT sectional image by adjusting the location of the iso-surface between two peaks and the location of the start point of the interval.
And step three, selecting one or two CT sectional images from all the CT sectional images in the XY direction, and selecting 6 or 8 sampling points from the selected CT sectional images.
In the step, the CT sectional view is selected, and the number of the selected sampling points is determined according to the type of the explosive column to be detected:
preferably, for the four-hole grain, a section at 1/2 of the height of the grain is selected from all CT section views in the XY direction, and 8 sampling points are arranged on the section. The sampling point position setting method is shown in fig. 1: one side of the selected section diagram is horizontally placed, four straight lines with equal angle intervals are set on the section diagram, and 8 intersection points of the four straight lines and the boundary of the drug column on the section diagram are sampling points.
Preferably, for the seven-hole and nineteen-hole drug columns, the section images positioned at the height 1/3 and 2/3 of the drug column are respectively selected from all CT section images in the XY direction, and 6 sampling points are respectively arranged on the two selected section images.
The setting method of the position of the seven-hole grain sampling point is shown in figure 2: on the first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the medicine column, and 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points; on the second CT sectional view, three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view are integrally rotated by 30 degrees, and at the moment, 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points.
The method for setting sampling point positions of nineteen-hole grains is shown in fig. 3: on the first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the explosive column and at the edge of the explosive column, and 6 intersection points of the three straight lines and the boundary of the explosive column on the sectional view are sampling points; on the second CT sectional view, three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view are integrally rotated by 30 degrees, and at the moment, 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points.
And step four, selecting two section maps along the diameter direction from all the CT section maps in the XZ direction, or selecting two section maps along the diameter direction from all the CT section maps in the YZ direction, and respectively arranging 6 sampling points on the two selected section maps.
In the step, the CT sectional view is selected, and the number of the selected sampling points is determined according to the type of the explosive column to be detected:
preferably, for the four-hole grain, two selected section views are respectively a section view in a YZ direction which crosses two holes along the diameter direction and does not penetrate the holes; for the seven-hole grain, two selected section pictures are respectively the section pictures in the YZ direction which transversely passes through the three holes and one hole along the diameter direction; for a nineteen-hole grain, two section views are taken in the XZ direction across five holes and three holes along the diameter direction.
Preferably, for the four-hole grain, the seven-hole grain and the nineteen-hole grain, the method for respectively arranging 6 sampling points on the two selected CT sectional views is the same, as shown in fig. 4, 5 and 6: and respectively arranging sampling points at two end points of two vertical edges and the middle point of the two end points on each section.
Measuring the thickness of the coating layer on each sampling point of the layout, measuring each sampling point for 3-9 times, and taking the average value of the measurement results as the thickness measurement value of the coating layer of the corresponding sampling point; the average value of the coating thickness of all the sampling points is obtained as the average value of the coating thickness of the insensitive propellant powder.
Preferably, the test of the sampling points is performed by using a caliper mode in a software measurement mode, and each sampling point is measured 6 times.
The preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not to be construed as limiting the present invention.
Example 1:
this embodiment provides a method for non-destructive testing of a thickness of a layer of a four-hole insensitive propellant charge, comprising the steps of:
sample preparation: taking a four-hole insensitive coated propellant, fixing the propellant on a foam block by using a double-sided adhesive tape, and then placing the foam block in the center of a sample table in a micro-focus X-ray computer tomography scanner;
sample scanning: the micro-focus CT model adopted by the embodiment is FF20 produced by Iredown company, a micro-focus mode is adopted, the voltage of an X-ray tube is set to be 70kV, the X-ray target power is 4.2W, the proportion of FDD and FOD is 25, the number of detector frames is 1.0Hz, the rotation angle is 360 degrees, 720 pieces of sampling data are obtained, and then a surface vibration detector is adopted to receive an X-ray signal to obtain two-dimensional DR data of the four-hole insensitive coated propellant powder;
data reconstruction and analysis: and performing three-dimensional CT reconstruction on the obtained two-dimensional DR data, wherein the reconstruction matrix is 2048 multiplied by 2048, and obtaining a three-dimensional CT reconstruction image of the four-hole insensitive coated propellant powder and sectional images in XY and YZ directions.
Then adopting VG Studio MAX3.0 image evaluation software to select 1/2 section images from all CT section images in XY direction, and laying out 8 sampling points according to the mode of figure 8; two pictures along the diameter direction are selected from all CT sectional views in the YZ direction, and 6 sampling points are respectively laid out according to the two modes of FIG. 9 and FIG. 10.
And measuring the thickness of the coating layer on 20 sampling points in the layout by adopting a caliper measuring mode, measuring 6 times at each sampling point, and taking an average value as the measured value of the thickness of the coating layer at the sampling point. The average of the coating thicknesses of the 20 sampling points was determined as the average of the coating thicknesses of the four-hole insensitive coated propellant.
TABLE 1 coating thickness measurement data Table
Figure BDA0003042179290000131
/>
In the embodiment, the cross section and the longitudinal section of the sample are directly obtained by performing micro-focus X-ray computer tomography scanning on the four-hole insensitive coated propellant powder sample, so that the thickness of the coating layer is measured, the average value of the thickness of the coating layer of the four-hole insensitive coated propellant powder sample is calculated to be 8.2 mu m, and the sample is not required to be cut before measurement. From Table 1, the distribution range of the thickness of the four-hole insensitive coating propellant package coating is (3.3-17.3) μm. The result shows that the coating material can not be uniformly coated on the surface of the propellant powder in the coating process, and the coating uniformity is influenced by the coating process and parameters thereof, so that the thickness distribution range of the coating layer can be used as direct parameters for representing the effect of the coating process, thereby guiding the setting of the parameters of the coating process.
Example 2:
this embodiment provides a method for non-destructive testing of the thickness of a coating of a seven-hole insensitive coated propellant package, comprising the steps of:
sample preparation: taking a seven-hole insensitive coating propellant powder, fixing the propellant powder on a foam block by using a double-sided adhesive tape, and then placing the foam block in the center of a sample table in a micro-focus X-ray computer tomography scanner;
sample scanning: the micro-focus CT model adopted by the embodiment is FF20 produced by Ireo-Lang company, a micro-focus mode is adopted, the voltage of an X-ray tube is set to be 80kV, the X-ray target power is 4.8W, the proportion of FDD and FOD is 10, the number of detector frames is 1.0Hz, the rotation angle is 360 degrees, 720 pieces of sampling data are obtained, and then a surface vibration detector is adopted to receive an X-ray signal to obtain two-dimensional DR data of the seven-hole insensitive coated propellant powder;
data reconstruction and analysis: and performing three-dimensional CT reconstruction on the obtained two-dimensional DR data, wherein the reconstruction matrix is 2048 multiplied by 2048, and obtaining a three-dimensional CT reconstruction image of the seven-hole insensitive coated propellant powder and sectional images in XY and YZ directions.
Then adopting VG Studio MAX3.0 image evaluation software to select two section images from all CT section images in XY direction, wherein 6 sampling points are respectively laid out on the two images according to two modes of figure 12 and figure 13; two sectional views along the diameter direction are selected from all CT sectional views in the YZ direction, and 6 sampling points are respectively laid out according to the two modes of FIG. 14 and FIG. 15.
And measuring the thicknesses of the coatings on 24 sampling points of the layout by adopting a caliper measuring mode, measuring 6 times at each sampling point, and taking an average value as a coating thickness measured value of the sampling point. The average value of the coating thickness of the 24 sampling points is obtained as the average value of the coating thickness of the seven-hole insensitive propellant.
TABLE 2 coating thickness measurement data sheet
Figure BDA0003042179290000151
Figure BDA0003042179290000161
In the above embodiment, the cross-sectional and longitudinal-sectional images of the seven-hole insensitive coated propellant powder sample are directly obtained by performing a micro-focus X-ray computer tomography scan on the seven-hole insensitive coated propellant powder sample, so that the thickness of the coating layer is measured, and the average thickness of the coating layer of the seven-hole insensitive coated propellant powder sample is calculated to be 9.1 μm without performing sample cutting before measurement. The distribution range of the coating thickness of the seven-hole insensitive coating propellant powder is (6.4-13.2) mu m can also be obtained from the table 2. As can be seen from comparison with Table 1, the thicknesses of the coating layers of the seven-hole insensitive coated propellant powder and the four-hole insensitive coated propellant powder are in one order of magnitude and are relatively close to each other. The result also shows that the coating material can not be uniformly coated on the surface of the propellant powder in the coating process, and the coating uniformity is influenced by the coating process and parameters thereof, so that the thickness distribution range of the coating layer can be used as direct parameters for representing the effect of the coating process, thereby guiding the setting of the parameters of the coating process.
Example 3:
the embodiment provides a nondestructive testing method for the thickness of a coating of a nineteen-hole insensitive coating propellant package, which comprises the following steps:
sample preparation: taking a nineteen-pore insensitive coated propellant, fixing the propellant on a foam block by using a double-sided adhesive tape, and then placing the foam block in the center of a sample table in a micro-focus X-ray computer tomography scanner;
sample scanning: the micro-focus CT model adopted by the embodiment is FF20 produced by Iredown company, a micro-focus mode is adopted, the voltage of an X-ray tube is set to be 90kV, the X-ray target power is 6.3W, the proportion of FDD and FOD is 5, the number of detector frames is 1.5Hz, the rotation angle is 360 degrees, 720 pieces of sampling data are obtained, and then a surface vibration detector is adopted to receive an X-ray signal to obtain two-dimensional DR data of nineteen-hole insensitive coated propellant powder;
data reconstruction and analysis: and performing three-dimensional CT reconstruction on the obtained two-dimensional DR data, wherein the reconstruction matrix is 2048 multiplied by 2048, and obtaining a three-dimensional CT reconstruction image of the nineteen-hole insensitive coated propellant powder and sectional images in XY and XZ directions.
Then adopting VG Studio MAX3.0 image evaluation software to select two section images from all CT section images in XY direction, wherein 6 sampling points are respectively laid out on the two images according to two modes of figure 17 and figure 18; two pictures along the diameter direction are selected from all CT sectional views in the XZ direction, and 6 sampling points are respectively laid out according to two modes of figure 19 and figure 20.
And measuring the thicknesses of the coatings on 24 sampling points of the layout by adopting a caliper measuring mode, measuring 6 times at each sampling point, and taking the average value of the 6 measurement results as the measured value of the coating thickness of the sampling point. The average value of the coating thickness at 24 sampling points was obtained as the average value of the coating thickness of the insensitive propellant powder.
TABLE 3 nineteen-hole medicine column coating thickness measurement data table
Figure BDA0003042179290000171
/>
Figure BDA0003042179290000181
In the above embodiment, the cross-sectional and longitudinal-sectional images of the nineteen-hole insensitive coated propellant powder samples are directly obtained by performing micro-focus X-ray computer tomography scanning on the nineteen-hole insensitive coated propellant powder samples, so that the thickness of the coating layer is measured, and the average value of the thickness of the coating layer of the nineteen-hole insensitive coated propellant powder samples is calculated to be 226.2 μm, and no sample cutting is required before measurement. Table 3 also shows that the distribution range of the coating thickness of the nineteen-hole insensitive coating propellant powder is (64.4-571.4) mu m. As can be seen by comparison of tables 1 and 2, the nineteen-hole desensitized coated propellant was about 25 times thicker than the four-and seven-hole desensitized coated propellant. The result also shows that the coating material of the nineteen-hole insensitive coated propellant powder cannot be uniformly coated on the surface of the propellant powder in the coating process, and the coating uniformity is influenced by the coating process and parameters thereof, so that the distribution range of the coating thickness can be used as direct parameters for representing the effect of the coating process, and the setting of the coating process parameters is guided.

Claims (8)

1. A nondestructive testing method for the thickness of a coating of an insensitive emission medicine package is characterized by comprising the following steps:
placing a to-be-detected insensitive emission drug column into the center of a sample table of a micro-focus CT device, and acquiring two-dimensional DR data of the insensitive emission drug column by a detector in a micro-focus cone beam mode;
step two, performing three-dimensional CT reconstruction on the two-dimensional DR data obtained in the step one to obtain a three-dimensional CT reconstruction image of the explosive column and CT sectional images of the coating layer in XY and XZ or YZ directions; respectively carrying out surface treatment and contrast adjustment on the obtained CT sectional view;
selecting one or two CT sectional views from all the CT sectional views in the XY direction, and selecting a plurality of sampling points for the selected CT sectional views;
selecting two section maps along the diameter direction from all the CT section maps in the XZ direction, or selecting two section maps along the diameter direction from all the CT section maps in the YZ direction, and respectively arranging a plurality of sampling points on the two selected section maps;
measuring the thickness of the coating layer on each sampling point of the layout, and taking the average value of the measurement results as the measured value of the thickness of the coating layer of the corresponding sampling point; the average value of the coating thickness of the insensitive propellant powder is obtained as the average value of the coating thickness of the insensitive propellant powder.
2. The method for nondestructive testing of the thickness of the coating of the insensitive emission package according to claim 1, wherein in the first step, the voltage of an X-ray tube is set to be 40KV to 100KV, the target power of the X-ray is set to be 2W to 7W, the magnification is set to be 3 to 30, and the number of frames of a detector is set to be 0.8Hz to 2.0Hz.
3. The method of claim 2, wherein in step one:
for a four-hole explosive column, setting the voltage of an X-ray tube to be 40KV to 80KV, the target power of X-rays to be 2W to 5W, the magnification to be 20 to 30 and the number of frames of a detector to be 0.8 to 1.8Hz;
setting the voltage of an X-ray tube to be 50KV to 90KV, the target power of X-rays to be 3W to 6W, the magnification to be 6 to 15 and the number of frames of a detector to be 0.8 to 1.8Hz for the seven-hole explosive column;
for a nineteen-hole explosive column, the voltage of an X-ray tube is 60KV to 100KV, the target power of the X-ray is 4W to 7W, the magnification is 3 to 10, and the number of frames of a detector is 1.0 to 2.0Hz.
4. The nondestructive testing method for the thickness of the coating of the insensitive emission drug package according to any one of claims 1 to 3, wherein in the third step, the selected CT sectional view and the selected sampling point are determined according to the type of the drug column to be tested:
for the four-hole grain, selecting a section diagram at the height 1/2 of the grain from all CT section diagrams in the XY direction, and arranging 8 sampling points on the section diagram;
for the seven-hole and nineteen-hole drug columns, the section diagrams at the 1/3 and 2/3 positions of the height of the drug column are respectively selected from all CT section diagrams in the XY direction, and 6 sampling points are respectively arranged on the two selected section diagrams.
5. The nondestructive testing method for the thickness of the coating of the insensitive emission drug package according to claim 4, wherein in the third step, the method for selecting the sampling points comprises the following specific steps:
for a four-hole grain, the sampling point position setting method is as follows: horizontally placing one side of the selected section diagram, setting four straight lines with equal angle intervals on the section diagram, wherein 8 intersection points of the four straight lines and the boundary of the explosive column on the section diagram are sampling points;
the setting method of the position of the seven-hole grain sampling point comprises the following steps: on the first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the explosive column, and 6 intersection points of the three straight lines and the boundary of the explosive column on the sectional view are sampling points; on the second CT sectional view, integrally rotating three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view by 30 degrees, wherein 6 intersection points of the three straight lines and the boundary of the drug column on the sectional view are sampling points;
the nineteen-hole grain sampling point position setting method comprises the following steps: on a first CT sectional view, three straight lines are adopted to respectively connect three pairs of holes on the outer ring of the grain and at the edge of the grain, and 6 intersection points of the three straight lines and the boundary of the grain on the sectional view are sampling points; on the second CT sectional view, three straight lines corresponding to the same positions of the three straight lines on the first CT sectional view are integrally rotated by 30 degrees, and at the moment, 6 intersection points of the three straight lines and the boundary of the medicine column on the sectional view are sampling points.
6. The nondestructive testing method for the thickness of the coating of the insensitive emission drug package according to any one of claims 1 to 3, wherein in the fourth step, the CT sectional view is selected and the number of the selected sampling points is determined according to the type of the drug column to be tested:
for the four-hole grain, two selected section pictures are respectively the section pictures in the YZ direction which crosses two holes along the diameter direction and does not penetrate the holes; for the seven-hole grain, two selected section pictures are respectively the section pictures in the YZ direction which transversely crosses three holes and one hole along the diameter direction; for a nineteen-hole grain, two section views are taken in the XZ direction across five holes and three holes along the diameter direction.
7. The nondestructive method for testing the thickness of the coating of the insensitive emission drug package as claimed in claim 6, wherein in the fourth step, for the four-hole column, the seven-hole column and the nineteen-hole column, the method for arranging 6 sampling points on the two selected CT sectional views respectively is the same as that for arranging the 6 sampling points on the two selected CT sectional views respectively: and respectively arranging sampling points at two end points of two vertical edges and the middle point of the two end points on each sectional view.
8. The nondestructive testing method for the thickness of the coating of the insensitive emission charge according to any of the claims 1 to 3, wherein in the fifth step, the test of the sampling points is performed by using a caliper mode in a software measurement mode, and each sampling point is measured 6 times.
CN202110460313.5A 2021-04-27 2021-04-27 Nondestructive testing method for coating thickness of insensitive transmitting explosive package Active CN113267148B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110460313.5A CN113267148B (en) 2021-04-27 2021-04-27 Nondestructive testing method for coating thickness of insensitive transmitting explosive package

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110460313.5A CN113267148B (en) 2021-04-27 2021-04-27 Nondestructive testing method for coating thickness of insensitive transmitting explosive package

Publications (2)

Publication Number Publication Date
CN113267148A CN113267148A (en) 2021-08-17
CN113267148B true CN113267148B (en) 2023-04-18

Family

ID=77229483

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110460313.5A Active CN113267148B (en) 2021-04-27 2021-04-27 Nondestructive testing method for coating thickness of insensitive transmitting explosive package

Country Status (1)

Country Link
CN (1) CN113267148B (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101285673A (en) * 2008-06-06 2008-10-15 太原理工大学 Capacitance ratio type ice-covering thickness sensor and its detection method
CN101308102B (en) * 2008-07-16 2010-08-11 中北大学 Computer tomography apparatus and method
CN103884726A (en) * 2014-03-04 2014-06-25 工业和信息化部电子第五研究所 Mmeasuring method of thickness of OSP (Organic Solderability Preservatives) film
DE102014219370A1 (en) * 2014-09-25 2016-03-31 Bayerische Motoren Werke Aktiengesellschaft Method for the non-destructive determination of fiber angles in sample sections made of fiber composite material
CN104268343B (en) * 2014-09-28 2018-01-12 北京理工大学 A kind of method of prediction of Turning Force with Artificial and temperature prediction for end mill cutting
CN109211947A (en) * 2018-09-13 2019-01-15 广东省测试分析研究所（中国广州分析测试中心） A kind of method that X-ray three-dimensional Micro-CT scanning characterizes glass fibre distribution and orientation in glass fibre reinforced composion

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Aoi Ariyasu.无.Non-destructive prediction of enteric coating layer thickness and drug dissolution rate by near-infrared spectroscopy and X-ray computed tomography.2017,全文. *
张帅.无. 包覆层厚度测量的悬臂梁挠度校正方法.2018,全文. *

Also Published As

Publication number Publication date
CN113267148A (en) 2021-08-17

Similar Documents

Publication Publication Date Title
Otani et al. Xray CT for Geomaterials: Soils, Concrete, Rocks International Workshop on Xray CT for Geomaterials, Kumamoto, Japan
Kumpova et al. X-ray dynamic observation of the evolution of the fracture process zone in a quasi-brittle specimen
Morris et al. New developments in proton radiography at the Los Alamos Neutron Science Center (LANSCE)
Stokes et al. Some new applications of collimated photon scattering for nondestructive examination
CN113267148B (en) Nondestructive testing method for coating thickness of insensitive transmitting explosive package
Reimers et al. Recent developments in the industrial application of computerized tomography with ionizing radiation
Anoshkin et al. Application of operational radiographic inspection method for flaw detection of blade straightener from polymeric composite materials
CN112964738B (en) Industrial CT rapid scanning system and method
Choi et al. Non-destructive investigation of texture by neutron diffraction
Li et al. Scanning transmission ion microscopy computed tomography (STIM-CT) for inertial confinement fusion (ICF) targets
KR101300269B1 (en) 3d computed tomography
KR101426245B1 (en) Three-dimensional computed tomography apparatus
CN109916794A (en) The lossless detection method of porosity of porous material based on industry CT
Xu et al. Application of industrial CT to nondestructive testing of composite materials
Fíla et al. Identification of strain fields in pure Al and hybrid Ni/Al metal foams using X-ray micro-tomography under loading
Glazkov et al. A neutron tomograph at the IR-8 reactor of the National Research Centre Kurchatov Institute
Maszybrocka et al. NDT Porosity Evaluation of AlSi10Mg Samples Fabricated by Selective Laser Sintering Method
Antolak et al. Density and composition analysis using focused MeV ion mubeam techniques
Revol et al. Non-destructive evaluation, inspection and testing of primary aeronautical composite structures using phase contrast X-ray imaging
McDaniel et al. In situ deformation apparatus for time-of-flight neutron diffraction: texture development of polycrystalline ice Ih
Borisenko et al. X-ray tomography characterization of density gradient aerogel in laser targets
He et al. Characterization of electrodeposited uranium targets
CN109990839B (en) Method and device for measuring morphological performance parameters of bilateral dislocation differential confocal fusion target pellet
Lee et al. On the Dimensional Change of Coated Fuel Particles upon Irradiation Testing
Cordes et al. Laboratory-Based 3D X-ray Imaging of Neutron-Irradiated Ceramic Particle Nuclear Fuel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant