DIAGNOSTICS OF THERMOPHYSICAL PROPERTIES AND QUALITY CONTROL FOR DEVICES MADE OF HIGH THERMAL CONDUCTIVITY MATERIALS
Annotation
Subject of study. We propose detection method for potential defects in the structure of device made of materials with high thermal conductivity, and thermal conductivity determination by the method of contact-free noninvasive thermal-imaging macrography. Method. The principle of the method lies in the following: local heating and cooling of the device is carried out, the temperature fields of its surfaces are measured. This method is based on the analysis of temperature fields. Main results. The study on the presence of defects in highly heat conductive material based on silicon carbide with diamond filling was performed. The experimental setup was developed. It consists of a measuring cell, a test sample with a cooler installed on the one edge and electric heater on the opposite edge. The test samples had the form of silicon carbide plates with diamond filling, each of 120×60 mm in size and 2 mm in thickness. Thermal imaging of samples was carried out. The samples heating range varied from 10 to 90 °С. The test samples were in radiation-convective heat exchange with the environment on both sides. Initially, it was unknown which of the samples has a defect. The thermograms with thermal imaging results were obtained. The analysis of the obtained thermograms was carried out; the temperature distribution on the samples was compared. As a result of this comparison, both the sample with a defect in the form of a crack (a stepwise temperature change in the crack region was observed), and the sample without defect (with the uniform temperature gradient) were determined. Practical relevance. The proposed method of thermal imaging is non-destructive, contactless and allows for the quality control of electronic devices made of highly conductive materials, as well as their thermal properties. The thermal conductivity of the sample can be determined by the temperature gradient and the measured heat flux values. This method is used for research of high-heat ceramic materials (with thermal conductivity above 200 W/(m·K)). Measurements were carried out in steady state behavior. At thermal imaging it is necessary to provide a high radiation coefficient of test sample observed surface. For this purpose, the surface is covered with paint with a radiation coefficient not less than 0.95 or the surface is covered with soot.
Keywords
Постоянный URL
Articles in current issue
- SURVEY ON FUZZY LOGIC METHODS IN CONTROL SYSTEMS OF ELECTROMECHANICAL PLANTS
EFFECT OF EXTERNAL CAVITY LENGTH WITH FIBER BRAGG GRATING ON SPECTRUM OF VERTICAL CAVITY SURFACE EMITTING LASER
TEMPERATURE VALUE EFFECT ON h-PARAMETER IN BIREFRINGENCE FIBERS
APPLICABILITY OF PHOTOFLUORESCENT TECHNIQUES FOR RESEARCH OF PROTEIN STRUCTURE DYNAMICS IN AQUEOUS SOLUTIONS
- EXPERIMENTAL RESEARCH OF DENDRITIC CRYSTALS FORMATION ON METAL SURFACE BY LASER RADIATION
METHOD OF SPACE IMAGES QUALITY IMPROVEMENT AT EARTH-VIEWING IN WINTER PHENOLOGICAL PERIOD
- GENERATION OF HIGH-INTENSITY PULSE INCOHERENT VISUAL OPTICAL SIGNALS IN 0.35-2.5 ΜM SPECTRAL RANGE
- NEW IDENTIFICATION ALGORITHM FOR LINEARLY VARYING FREQUENCY OF SINUSOIDAL SIGNAL
- OPTIMAL CONTROL AS CONDITIONAL VARIATIONAL PROBLEM WITH VARIABLE RIGHT ENDPOINT
- FEATURES OF DIAZO DYE PHOTODECOMPOSITION IN AQUEOUS SOLUTIONS CONTAINING ZINC, ALUMINUM AND ERBIUM SALTS
- NEW OPTICAL-ELECTROCHEMICAL MICROBIOTESTING SYSTEM FOR VALUATION OF OIL PRODUCTS TOXICOSAFETY
- TEMPERATURE EFFECT ON NONLINEAR INFORMATION RECORDING PROCESS IN CHROMONE-BASED PHOTOSENSITIVE MEDIA
- DISSIPATIVE METHOD OF RESEARCH OF HIGH-VISCOSITY MEDIA RHEOLOGICAL PROPERTIES
- INFORMATION SECURITY METHODS FOR COMMUNICATION CHANNELS IN MULTIAGENT ROBOTIC SYSTEMS
- MQTT DATA PROTOCOL IN REMOTE ACCESS CONTROL MANAGEMENT MODEL FOR INTERNET NETWORKS
ONTOLOGICAL APPROACH TO MUSEUM MICROCLIMATE CONTROL PROCESS AUTOMATION AND SECURITY
- METHODS FOR BIFURCATION AND RECURRENT ANALYSIS OF NONLINEAR DYNAMICAL SYSTEMS ON MEMRISTIVE CIRCUIT EXAMPLE
- RESEARCH OF SOME PROPERTIES OF ALPHABETS BASED ON MUTUALLY ORTHOGONAL BROADBAND SIGNALS
- PARAMETRIC IDENTIFICATION FOR SHIP HULL FORMS BY SYMMETRIC MOTIONS AROUND A YAW ANGLE
- OPTIMIZATION OF DANGEROUS SECTION PASSAGE FOR UNMANNED VEHICLES
- SYSTEM COMPLETENESS OF RESONANCE STATES FOR GRAPHS WITH DIFFERENT GEOMETRY
- EXPERIMENTAL STUDY OF FERROMAGNETIC OBJECTS HEATING DURING MAGNETIC RESONANCE IMAGING
- STUDY OF MVDR DUAL-MICROPHONE ALGORITHM FOR SPEECH ENHANCEMENT IN COHERENT NOISE PRESENCE
- APPLICATION OF SDK LABORATORY STANDS IN EDUCATION