1. A testing apparatus of a magnetic recording medium for conducting test on said magnetic recording medium through recording testing data onto said magnetic recording medium by means of a magnetic head and reproducing recorded testing data by means of said magnetic head, so as to perform a predetermined process on reproduced testing data, comprising:
plural conversion means for converting the reproduced testing data into digital values;
sampling clock control means for operating said plural conversion means, at a predetermined sampling frequency for each one of said plural converter means;
plural holding means for holding the digital values converted by said plural converter means; and
data processing means for conducting a calculation process in relation to a magnetic characteristic of said magnetic recording medium from digital values held by said plural holding means, thereby conducting the test on said magnetic recording medium.
2. A testing apparatus as claimed in claim 1, wherein said calculation process is a statistic calculation process or a frequency analysis calculation process, in which a peak value of said reproduced testing data or a threshold value time when exceeding or being below an arbitrary threshold value is measured with using the digital values, thereby to calculate an average value or a dispersion value or a deviation value or a cumulative frequency with respect to said peak value or said threshold value time.
3. A testing apparatus of a magnetic head for conducting test on said magnetic head through recording testing data onto a magnetic recording medium by means of said magnetic head and reproducing recorded testing data by means of said magnetic head, so as to perform a predetermined process on reproduced testing data, comprising:
plural conversion means for converting the reproduced testing data into digital values;
sampling clock control means for operating said plural conversion means, at a predetermined sampling frequency for each one of said plural converter means;
plural holding means for holding the digital values converted by said plural converter means; and
data processing means for conducting a calculation process in relation to a magnetic characteristic of said magnetic recording medium from digital values held by said plural holding means, thereby conducting the test of said magnetic head.
4. A testing apparatus as claimed in claim 3, wherein said calculation process is a statistic calculation process or a frequency analysis calculation process, in which a peak value of said reproduced testing data or a threshold value time when exceeding or being below an arbitrary threshold value is measured with using the digital values, thereby to calculate an average value or a dispersion value or a deviation value or a cumulative frequency value with respect to said peak value or said threshold value time.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for coating a surface of a turbine component with an environment-resistant and wear-resistant material, comprising the step of:
forming an abrasive coating by cold gas-dynamic spraying a powder material on the turbine component surface, the powder material comprising a mixture of:
MCrAlY powder, with M being selected from Ni, Co and mixtures thereof, and
an abrasive powder being selected from the group consisting of cubic boron nitride, diamond, carbides, and oxides; and
heating the turbine component after forming the abrasive coating at a temperature sufficiently high to consolidate and homogenize the abrasive coating.
2. The method of claim 1, wherein the turbine component is a turbine blade.
3. The method of claim 2, wherein the surface of the turbine blade surface being sprayed is an airfoil tip surface.
4. The method of claim 2, wherein the surface of the turbine blade surface being sprayed is an airfoil leading edge surface.
5. (canceled)
6. The method of claim 1, wherein the heating step is performed between about two and about eight hours.
7. The method of claim 1, wherein the heating step is performed at a temperature between about 1900 and about 2050\xb0 F.
8. The method of claim 1, further comprising the step of:
machining the turbine component to bring the sprayed powder material to a thickness between about 0.002 and about 0.100 inch.
9. The method of claim 1, wherein the mixture of MCrAlY powderabrasive powder is at a percentage ratio between about 9010 and about 2080 by weight.
10. A method for coating a surface of a turbine component with an environment-resistant and wear-resistant material, comprising the step of:
forming an abrasive coating by cold gas-dynamic spraying a powder material on the turbine component surface, the powder material comprising a mixture of:
MCrAlY powder, with M being selected from Ni, Co and mixtures thereof, and
an abrasive powder being selected from the group consisting of carbides, and oxides; and
heat treating the turbine component at a temperature sufficiently high to consolidate and homogenize the abrasive coating after the cold gas-dynamic spraying.
11. The method of claim 10, wherein the turbine component is a turbine blade.
12. The method of claim 11, wherein the surface of the turbine blade surface being sprayed is an airfoil tip surface.
13. The method of claim 11, wherein the surface of the turbine blade surface being sprayed is an airfoil leading edge surface.
14. (canceled)
15. The method of claim 10, wherein the heat treatment is performed between about two and about eight hours.
16. The method of claim 10, wherein the heat treatment is performed at a temperature between about 1900 and about 2050\xb0 F.
17. The method of claim 10, further comprising the step of:
machining the turbine component to bring the sprayed powder material to a thickness between about 0.002 and about 0.100 inch.
18. The method of claim 10, wherein the mix of MCrAlY powderabrasive powder is at a percentage ratio between about 9010 and about 2080 by weight.