Sample Preparation Techniques (Theory & Applications)- Microsectioning Technology, Metallography
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1 Sample Preparation Techniques (Theory & Applications)- Microsectioning Technology, Metallography
2 Introduction: Challenges of Microelectronic Cross-Sectioning Complexities of Modern Microelectronics Planning a Course of Action
3 Complexities of Modern Microelectronics Current microelectronic cross-sectioning requires us to deal with the following issues: Decreasing Feature Size Combined Materials Properties
4 Combined Materials Properties Microelectronics and their packaging are COMPOSITE structures. Many of the materials found in microelectronic samples have widely varying materials properties.
5 Comparative Description of Materials Properties Material Hardness Ductile/Brittle Silicon Moderate Brittle Gallium Arsenide Moderate Brittle Aluminium Soft Ductile Oxide Films Hard Brittle Solders Very Soft Ductile Gold Wires Very Soft Ductile Ceramic Substrates Hard Brittle Insulators Hard Brittle Tungsten Hard Ductile Ti/W Hard Ductile
6 Microstructure Macro - see with an unaided eye Micro - need a microscope to see Atomic the position of the atoms in the unit cell Structure - how things are put together BCC FCC
7 Why Microstructures are Important Characterize materials for different applications Control manufacturing processes Analyze failures
8 Information Observed Specimen preparation quality is the determining factor in the value of the examination.
9 Preparation Requirements Freedom from deformation Absence of thermal damage Flatness Freedom from scratches
10 Preparation Steps Each step is equally important Sampling Sectioning Mounting Grinding and Polishing Visual Examination Etching Analysis
11 Sectioning
12 Mounting - Compression Introduction
13 Mounting - Castable Introduction
14 Grinding / Polishing Introduction
15 Introduction Analysis Capture photos / electronic images Comparison charts Depth / thickness measurements Image analysis
16 Sampling Sampling Specimens selected must be representative of the material to be examined Driven by the type of the investigation Quality Control Failure Analysis Research and Development
17 Sectioning Sectioning Removing a specimen from a larger component Final size: typically 2 inches or less in diameter Cut plane should be as near to the desired location as possible Aggressive cutting methods will require excessive damage to be removed Re-sectioning the specimen Grinding beyond the deformation depth
18 Sectioning Sectioning Parameters Equipment (Abrasive cut-off, Precision saw) Blade, Wheel (SiC, Al 2 O 3, diamond) Method Load Speed Feed Rate Contact Area Coolant Note: Delicate materials may require encapsulation
19 Sectioning Abrasive Wheel Selection SiC wheel - nonferrous materials Al 2 O 3 wheel- ferrous materials Hard wheel / soft material Soft wheel / hard material
20 Sectioning Cut-off Wheel Selection Application Bond Abrasive Tool Steels 60 HRC & Above Carburized Steels Rubber resin Al 2 O 3 Hard Steel 50 HRC Rubber resin Al 2 O 3 Medium Steel HRC Rubber resin Al 2 O 3 Soft or Annealed Steel HRC, HRB Rubber Al 2 O 3 Medium Hard Nonferrous Materials, Uranium, Titanium, Zirconium Soft Nonferrous Materials, Aluminum, Brass, etc. Very Hard, Brittle Fracture Materials Carbides, Ceramics, Petrographic Rubber Rubber Metal SiC SiC Diamond
21 Sectioning Selecting a Method MACC - Minimum Area of Contact Cutting To minimize damage Keep pressure on abrasive particles as low and constant as possible Minimize contact area between wheel and specimen
22 Sectioning Methods Available a -Chop b -Pulse c -Oscillation d-traverse and increment e -Orbital cutting
23 Sectioning Troubleshooting Problem Possible Cause Suggested Remedy Burning (bluish discoloration) Rapid wheel wear Frequent wheel breakage Resistance to cutting Overheated specimen Wheel bond breaking down too rapidly Loose specimen fixturing Uneven coolant distribution Wheel glazing Slow wheel breakdown Increase coolant rate Lighten cutting pressure Choose wheel for harder material Decrease feed rate Choose wheel for softer material Lighten cutting pressure Clamp the specimen rigidly Choose wheel for harder material Use minimal area contact cutting Choose wheel for harder material Reduce coolant flow Cutter stalls Cutter capacity inadequate Use cutter with greater Hp Limit specimen size
24 Sectioning Methods: Cleaving Advantages: Fast! Semiconductors and insulators break cleanly. Can be used to section an individual feature or to quickly reduce the size of a large sample.
25 Disadvantages Metals and polymers don t cleave well. Cleave doesn t always hit desired feature. Can only be used for bare die
26 Sectioning Methods: Diamond Saw Sectioning Advantages: Relatively fast. Can be used on almost any sample In most cases, can be used to trim sample close to target feature.
27 Disadvantages Cannot be used to produce a finished cross-section. Slow cutting through potted samples. Creates damage that must be removed.
28 Choosing an appropriate blade for Diamond Saw Sectioning BLADE PURPOSE 15 HC, LC General Purpose Blades for Sectioning Metals, Ceramics, Composites, etc. 10 LC Ideal for sectioning Packaged Semiconductors with mineral filled epoxy packaging, or samples with organic or ceramic substrate. 5 LC Ideal for sectioning Bare Die Semiconductors without packaging.
29 Why Mount Specimens? Mounting of Specimens Protect edges during polishing process Protect delicate samples Increase life of polishing surfaces Uniformity - allowing for automation Safety
30 Mounting of Specimens Methods Clamp Mounting Compression (Hot) Mounting Pressure Heat Castable (Cold) Mounting Resin selection Vacuum
31 Mounting of Specimens Method Selection Specimen characteristics to consider Brittle, Friable Heat Sensitive Porosity Level EPOMET EPOXICURE vacuum impregnated
32 Selecting a Mounting Compound Mounting of Specimens Phenolic (Phenocure ) Economical High Shrinkage Low Hardness Poor Edge Retention Epoxy (Epomet ) High Hardness Low Shrinkage Chemically Resistant Acrylics (Transoptic ) Transparent Slow Cure Fair Hardness Defect Prone Low Chemical Resistance
33 Castable Mounting Cold Mounting Acrylics Varidur Sampl-Kwick Epoxies Epo-Kwick Epoxicure Epo-Thin Epo-Color Mounting of Specimens
34 Castable Mounting Typical Parameters Mounting of Specimens Acrylics 5-15 min. curing; F Epoxies 30 min hr. curing; F
35 Troubleshooting Castable Resins Variables Quantity Ambient temperature Mold type Specimen size {speaker} Incorrect mixing, mixture not homogenous Inaccurate proportioning of resin to hardener Shelf life typically is one year Specimens not fully dried Mounting of Specimens
36 Grinding Grinding Principles Fixed and semi-fixed abrasives surfaces SiC Ultra-Prep diamond disks BuehlerHercules (Hard and Soft) Abrasive size: 150 to 5µm Use lubricant to minimize thermal damage and remove debris from the platen
37 Grinding Initial Grinding Step Goals Remove the damage resulting from the sectioning process Establish a planar surface Reach a specific plane close to a desired area/feature Extent of sectioning damage determines the selection of the initial abrasive size
38 Grinding Subsequent Steps Remove damage from previous step(s) Decreasing abrasive size Depth of damage decreases Removal rate decreases Depth of damage is greater for soft materials than hard materials
39 Polishing Polishing Principles Resilient surfaces with abrasives applied Cloths: woven, pressed, napped Reveal true microstructure of the material Maintain flatness Keep artifacts to an absolute minimum
40 Polishing Final Polishing Principles Remove any remaining artifacts or smear Produce a lustrous, scratch-free surface Maintain edge retention as much as possible
41 Grinding / Polishing Abrasives SiC Polymers Metals Al 2 O 3 Ferrous based materials Diamond Metals Ceramics Composites SiO 2 Non-ferrous materials
42 Grinding / Polishing SiC papers Typical sequence 240 (P280) 320 (P400) 400 (P600) 600 (P1200)
43 Grinding / Polishing Grit Equivalency Chart USA Grit (ANSI / CAMI) European Grit (FEPA P) Approx. Size (µm) P P P P P P2500 7
44 Grinding / Polishing Diamond Monocrystalline Polycrystalline Polycrystalline shorter preparation times higher surface area on the diamond particles provides more cutting points
45 Grinding / Polishing Applying Diamond Abrasive Metadi Suspension Each squirt from the bottle about 1 ml Add at the beginning and then about every 30 sec. Metadi Paste Apply even across the selected surface Add Metadi fluid at the beginning and then about every 30 sec.
46 Grinding / Polishing Amount of Abrasive Too little cutting rate reduced Too much hydroplaning Variables Surface selected Format size: 8 vs. 10 Platen RPM Removal Rate (um/min) ml/min 1.83 ml/min ml/min Texmet 1000 UltraPol Hercules H Parameters: Al specimens, 9µm diamond, 150 RPM, 5 lbs/specimen, 8 format
47 Grinding / Polishing Final Polish Solutions Alumina Ferrous based Carbides Cu, Ni alloys Pb, Sn, solder Collodial Silica Ceramics Cast irons Light metals (Al, Mg, Be) Refractory metals Polymers Printed Circuit boards
48 Grinding / Polishing Surface Selection Grinding SiC papers, Diamond disk, BuehlerHercules Polishing Cloths: woven/pressed, napped Woven / Pressed Napped
49 Grinding / Polishing Selection Theory Fixed abrasive: The action of a given abrasive size will vary based on the bonding method and abrasive type Applied abrasive: The action of a given size abrasive will vary according to the surface on which it is charged A harder surface will cause an abrasive to act more aggressively than a soft surface The texture of the surface will also affect edge rounding and relief (this applies mostly to napped cloths)
50 Grinding / Polishing Surface Comparison 30 Material Removal (um/min) Microcloth Texmet 1000 UltraPol Hercules S Hercules H Parameters: Al specimens, 9µm diamond, 150 RPM, 5 lbs/specimen
51 Grinding / Polishing Typical Polishing Surfaces ULTRA-PAD ULTRA-POL TEXMET 1000 TRIDENT
52 Typical Final Polishing Surfaces Grinding / Polishing MICROCLOTH CHEMOMET
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