2018-07-23 12:14:38 SUSHI GUANGBO TEST TECHNOLOGY CO.,LTD 已读
(1) Observation and measurement of electron microscopic morphology
The microscopic geometry of the surface of the material largely affects its many technical properties and functions. In recent years, with the development of science and technology, the surface precision of various materials has been raised more and more.
Scanning electron microscopy is a commonly used analytical technique for surface morphology observation. High resolution, high magnification; good depth of field effect, large field of view, three-dimensional imaging, direct observation of the fine structure of the uneven surface of various samples; simple sample preparation; equipped with X-ray energy spectrometer Morphological observation and micro-area composition analysis can be performed simultaneously.
Observing the surface topography of the material by scanning electron microscopy provides convenience for studying the morphology of the sample and helps to monitor product quality and improve the process.
The main content of observation is to analyze the geometric shape of the material, the particle size of the material, the distribution of the particle size, the structure of the phase, and the like.
Materials, electronics, metallurgy, aviation, automotive geosciences, medicine, machining, semiconductor manufacturing, ceramics, etc.
The sample is plated with platinum and placed in a scanning electron microscope sample chamber according to standard working procedures. The test position required by the customer is magnified and measured.
JYT 010-1996 General rules for analytical scanning electron microscopy
(2) Optical microscopic morphology observation and measurement
The optical microscope uses the principle of magnifying imaging of a convex lens to enlarge a small object that cannot be distinguished by the human eye to a size that can be resolved by the human eye. The main purpose is to increase the opening angle of the near-minor object to the eye (the object with a large viewing angle is imaged on the retina) Big). Ordinary light has a wavelength of 400-700 nm, the best resolution for an optical microscope is 0.2 um, and the resolution of the human eye is 0.2 mm, so the maximum magnification of a microscope is usually 1000 X. A typical optical microscope has a number of interchangeable objectives so that the observer can change the magnification as needed. Because of the use of visible light as a light source, optical microscopy is very sensitive and accurate for color recognition. Not only can the surface layer of the sample be observed, but also a certain range of tissue below the surface layer can be observed.
The optical microscope is easy to operate, intuitive, and highly efficient. It is suitable for surface observation and measurement. It can not only identify and analyze surface defects of various metals, alloys and non-metal products, and integrated circuits, printed circuit boards, wires, fibers and surfaces. Inspection of surface phenomena such as spraying can also be widely used in the electronics, chemical and instrumentation industries to observe opaque substances and transparent substances.
Various industries pay more and more attention to the appearance and other issues, and the requirements for the manufacturing process of the products are becoming more and more strict. The rating of the appearance of the products largely reflects the quality of the products. By using optical amplification aids to check product shape, assembly, surface cracks, holes and poor soldering defects, inspection of the production line process, the quality of printed circuit boards and soldering defects in circuit components, etc., to help monitor the manufacturing process Corrective measures shall be taken in time for the results of the inspection to provide guidance for the operation of the production process and product quality assurance to ensure that the product meets the shape, fit and functional requirements in the final use environment.
According to the use characteristics of the parts, the acceptance criteria generally include three conditions: ideal condition, acceptance status, and rejection status. Mainly used in the inspection of tooling inspection tools, metal parts, electronic product assembly, offset, welding abnormality inspection, PCB/PCBA circuit, anti-welding, hole, part alignment and text pattern defect inspection.
Confirm sample type → Confirm inspection specification → Observe the sample under the optical microscope → Record observation phenomenon → Result evaluation
bIPC-6012 rigid printed board identification and performance specifications
Acceptability of IPC-A-610 electronic components
Acceptability of IPC-A-600 printed boards