Hardness testing of Ceramic Fibre Shapes

B

Brian Dowsett

#1
Folks.
Has anyone found a way to measure hardness of ceramic fibre shapes?. We buy crucibles for high temperature melting, which we would like to control for hardness. However, checking with a standard durometer gives a lot of measurement system variation and certainly would not meet normal gauge variation requirements. Obviously checking repeatability is difficult because each time the gauge is used in an area, it makes an indentation - meaning that the reading in that area cannot be repeated. However, meeting the requirements for doing the study is not my major concern- i'd just like a better way to measure product quality.

For info, the shape is cylindrical, about 3 inches in diameter.

Thanks

brian
 
Elsmar Forum Sponsor

Jerry Eldred

Forum Moderator
Super Moderator
#2
I will have to defer this one, as I am not an expert in this area. The only minor point I noted is that perhaps on a particular sample, you could take multiple readings, and for each reading, use an untouched surface area of the sample. Perhaps you could establish a minimum number of readings that would provide you with acceptable measurement variability. I do recall from my limited exposures to Rockwell Hardness standards, that they are not very stable. My recommendation would be to seek out some industry experts. It may be that you could refine measurement methodology, and add some metrology engineering to the measurement (i.e.: devise some details to how you perform the reading such as sample placement, penetration depth, variations on probe tip used and other such details - not being an expert on this, I won't make any specific recommendations). Is there a hardness standard available with a similar hardness rating that you could use to develop methodology.

Just a bit of rambling to try to add something. Apologies that I can not be of much use in this matter.

------------------
 
Thread starter Similar threads Forum Replies Date
C Hardness Testing - Low Cpk's using Minitab Misc. Quality Assurance and Business Systems Related Topics 10
O Hardness Testing and Certifying Product AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 6
L Hardness Testing - Rockwell 15T Scale Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
J Hardness Testing E error requirement, Why? Various Other Specifications, Standards, and related Requirements 4
J Rockwell Hardness Testing Question Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
Ron Rompen HV Hardness Testing Conversions - CRA 1070, tempered 440-520 HV10 Various Other Specifications, Standards, and related Requirements 2
B Certifying our house for Hardness and Conductivity Testing General Measurement Device and Calibration Topics 8
ScottK Portable Hardness Testing and Testers for Incoming Bar Stock Testing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
B Portable hardness testing recommendations - Upper Rockwell B scale Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
M Hardness Testing - Rockwell C, on 2" OD x 1" ID Tube of SAE 4140 steel Manufacturing and Related Processes 9
Geoff Cotton Vickers hardness testing - Gage R&R Study for Hardness m/c Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
M Proper terms for describing Hardness General Measurement Device and Calibration Topics 5
J Hardness inspection Audit Finding Employee error Nonconformance and Corrective Action 6
S GR&R for Hardness Tester and Arc Spark Spectrometer Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 15
S Portable Magnetic Hardness Testers - Aerospace Manufacturing and Related Processes 4
P Very cheap Hardness Blocks unfortunately without Traceability General Measurement Device and Calibration Topics 11
kedarg6500 How much test force to be applied for Vickers hardness Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
K Wilson Hardness Tester Model 525 Accuracy/Repeatability issues help General Measurement Device and Calibration Topics 4
Johnnymo62 What oil do I use for our Starrett 3814 Hardness Tester? General Measurement Device and Calibration Topics 1
kedarg6500 CA111-SAE Copper Washer Hardness Measurement Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
W MSA on a Hardness Tester to satisfy a Customer who is requiring Hardness Cpk Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 17
Geoff Cotton Measurement Uncertainty (MU) of HR-150A Rockwell Hardness Tester Measurement Uncertainty (MU) 1
N Verifying Calibration of Hardness Gauge vs Actually Calibrating It General Measurement Device and Calibration Topics 2
M MSA - What method should we use for the stability of hardness? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
S ASTM Standard for Hardness Spec for 6063 T6 Aluminum Extrusions Various Other Specifications, Standards, and related Requirements 1
Q Definition Rockwell Hardness definitions - BW 96 Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 3
V What should I require of a Heat Treat PPAP? Surface Hardness per SAE J664 APQP and PPAP 1
J Requirements for Hardness of Metrology Instrument Parts General Measurement Device and Calibration Topics 3
Ron Rompen Recommended Rockwell 30T Scale Hardness Tester to verify Incoming Product General Measurement Device and Calibration Topics 1
G Hoffman Scratch Hardness Test - General Parameters for Pass/Fail (Paint Coatings) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
W Cpk for Hardness - PPAP rejected due to no Cpk value being given for a hardness FMEA and Control Plans 10
Ron Rompen Affri MetalTest Portable Hardness Tester Review General Measurement Device and Calibration Topics 1
C MSA for Hardness Machine and Tensile/Compressive Machine Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
J Any Difference Between Bench Top and Portable Hardness Tester? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
J Hardness Inspection Test - Rockwell in Lieu of Brinell General Measurement Device and Calibration Topics 6
somashekar Information sharing: Week 22, 2010 (HARDNESS, THREADS, BEARINGS) The Reading Room 3
Q Calibration of Hardness Tester ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 12
J Sources of Potential Measurement Variation for Brinell Hardness Test Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
A Difficulties in performing MSA on Rockwell Hardness Tester Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 20
A Cause and Effect Analysis - Hardness of Rubber (i.e., durometer) Quality Tools, Improvement and Analysis 11
I Are there any Procedures or Standard relating to Retesting of Hardness of bolts? Quality Manager and Management Related Issues 5
C Specification (hardness) for stainless steel SUS 310 3/4 Hard Manufacturing and Related Processes 3
A Calibration of Rockwell Hardness Tester IATF 16949 - Automotive Quality Systems Standard 10
P Micro Hardness Tester Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
K Rockwell Hardness Testers ? Brand Recommendation Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
B Expiration Date for Standardized Rockwell Hardness Blocks Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
K Certifying Existing Hardness Tester Indenters / Penetrators General Measurement Device and Calibration Topics 9
kedarg6500 Potential Failure Mode - Mix Charge for Hardness - Casting Process FMEA and Control Plans 1
E Units of Measure for Case Hardness such as HV, HRB, HRC, etc. Various Other Specifications, Standards, and related Requirements 7
J How to calibrate Hardness Rockwell, Brinnell & Vickers Tester machine General Measurement Device and Calibration Topics 5

Similar threads

Top Bottom