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YY/T 0641-2008 PDF English

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YY/T 0641-2008: Standard Test Method for Transformation Temperature Of Nickel. Titanium Alloys by Thermal Analysis
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YY/T 0641-2008115 Add to Cart Auto, 9 seconds. Standard Test Method for Transformation Temperature Of Nickel. Titanium Alloys by Thermal Analysis Valid

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YY/T 0641-2008: Standard Test Method for Transformation Temperature Of Nickel. Titanium Alloys by Thermal Analysis


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YY PHARMACEUTICALS INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 11.040.40 C 35 Standard test method for transformation temperature of nickel-Titanium alloys by thermal analysis ISSUED ON: APRIL 25, 2008 IMPLEMENTED ON: JUNE 01, 2009 Issued by: China Food and Drug Administration

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Term ... 4 4 Summary of test methods ... 5 5 Meaning and use ... 5 6 Interference ... 5 7 Instrument ... 6 8 Sample preparation ... 6 9 Temperature calibration ... 6 10 Test procedure ... 6 11 Conversion of graphical data ... 7 12 Report ... 8 13 Accuracy and deviation ... 8 14 Keywords ... 9 Standard test method for transformation temperature of nickel-Titanium alloys by thermal analysis

1 Scope

This standard specifies the procedure for measuring the transformation temperature of NiTi shape memory alloys. The value indicated in the SI unit is considered standard. This standard does not indicate that it involves safety related to the use of the standard. It is the responsibility of users of this standard to establish special operating procedures to ensure the safety of use and personnel health before use, and to determine the applicability of the management scope.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. ASTM E 473 Standard terminology relating to thermal analysis ASTM E 967 Standard test method for temperature calibration of differential scanning calorimeters and differential thermal analyzers ASTM E 1142 Standard terminology relating to thermophysical properties ASTM F 2005 Standard terminology for nickel-titanium shape memory alloy

3 Term

For the technical terms used in this test method, see ASTM E 473, ASTM E 1142, ASTM F 2005.

7 Instrument

7.1 Use the difference display thermometer which has a heating and cooling rate reaching 10 °C/min, which can automatically record the input energy difference between the measured sample and the reference sample according to the required sensitivity and accuracy. 7.2 Use a sample cuvette or pan made of aluminum or other inert materials with high thermal conductivity. 7.3 Use clean nitrogen or helium. 7.4 Use an analytical balance with a sensitivity of 0.1 mg and a measuring range of 100 mg.

8 Sample preparation

8.1 Use (20 ~ 50) mg of sample. Cut the sample, to get the largest surface in contact with the DSC sample pan. 8.2 Place it in vacuum, or in air at 800 °C for 15 min which has sufficient protection to prevent oxidation for annealing. Quickly cool the sample, to prevent phase precipitation that can change the alloy transformation temperature. 8.3 Clean the sample to remove all foreign material contamination, such as cutting fluid. If the sample is oxidized during heat treatment, grinding, polishing or corrosion, the oxide layer shall be removed. Care shall be taken to avoid cold working of the sample, because cold working will change the thermal effect (characteristic curve) of the sample. Slight oxidation is allowed, but all thick scale shall be removed.

9 Temperature calibration

In accordance with ASTM E 967, use the same heating rate, clean gas, and flow rate to calibrate the temperature axis of the instrument as used in the actual test sample.

10 Test procedure

10.1 Put the sample into the sample pan; place the sample pan on the test bench. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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