Claims
- 1. A magnetic head slider comprising a substrate consisting essentially of:
- (a) 100 parts by weight, consisting of aluminum oxide and 30 to 50 parts by weight of (TiC+TiO.sub.2), and provided that TiO.sub.2 /(TiC+TiO.sub.2).times.100=5 to 15%;
- (b) greater than one to 5 parts by weight of a machinability agent which is MgO, NiO, Cr.sub.2 O.sub.3 or ZrO.sub.2 ; and
- (c) 0.05 to 2 parts by weight of Y.sub.2 O.sub.3.
- 2. A method of preparing a magnetic head slider comprising the following steps:
- (1) preparing a green compact by molding a raw material mixture which contains:
- (a) 100 parts by weight, consisting of aluminum oxide and 30 to 50 parts by weight of (TiC+TiO.sub.2), and provided that TiO.sub.2 /(TiC+TiO.sub.2).times.100=5 to 15%;
- (b) 0.5 to 5 parts by weight of a machinability agent which is MgO, NiO, Cr.sub.2 O.sub.3 or ZrO.sub.2 ; and
- (c) 0.05 to 2 parts by weight of Y.sub.2 O.sub.3 ;
- (2) presintering said green compact in a reducing or inert atmosphere to produce a presintered compact which has a density of more than 94 percent of the theoretical density;
- (3) subjecting said presintered body to hot isostatic pressing to effect sintering; and
- (4) machining the resulting sintered body to provide a substrate for the magnetic head slider.
- 3. A method of preparing a magnetic head slider comprising the following steps:
- (1) preparing a green compact by molding a raw mixture which contains:
- (a) 100 parts by weight, consisting of aluminum oxide and 30 to 50 parts by weight of (TiC+TiO.sub.2), and provided that TiO.sub.2 /(TiC+TiO.sub.2).times.100=5 to 15%;
- (b) 0.5 to 5 parts by weight of a machinability agent which is MgO, NiO, Cr.sub.2 O.sub.3 or ZrO.sub.2 ; and
- (c) 0.05 to 2 parts by weight of Y.sub.2 O.sub.3 ;
- (2) subjecting said green compact to a hot pressing to effect sintering; and
- (3) machining the resulting sintered body to provide a substrate for the magnetic head slider.
- 4. The method according to claim 2, wherein the TiC is of a slightly rounded shape prepared by low-temperature carbide-forming.
- 5. The method according to claim 2, wherein the amount of machinability agent is greater than one part by weight.
- 6. The method according to claim 2 wherein step (3) is effected in an inert gas atmosphere at about 1400.degree. C. and under a pressure of at least about 1000 kg/cm.sup.2.
- 7. The method according to claim 3 wherein step (2) is effected in an inactive atmosphere at 1350.degree. C. to 1850.degree. C. and under a pressure of at least about 200 kg/cm.sup.2.
- 8. The method according to claim 3 wherein the TiC is of a slightly rounded shape prepared by low-temperature carbide-forming.
- 9. The method according to claim 3 wherein the amount of machinability agent is greater than one part by weight.
- 10. A magnetic head slider comprising a substrate having an improved machinability and being substantially pore-free, the substrate having been produced by the method of claim 5.
- 11. A magnetic head slider comprising a substrate having an improved machinability and being substantially pore-free, the substrate having been produced by the method of claim 9.
Priority Claims (2)
Number |
Date |
Country |
Kind |
56-2298 |
Jan 1981 |
JPX |
|
56-2297 |
Jan 1981 |
JPX |
|
RELATED APPLICATIONS
This application is a continuation of application Ser. No. 575,475, filed Jan. 30, 1984, which is a continuation of Ser. No. 327,371, filed Dec. 4, 1981, both now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4130847 |
Head et al. |
Dec 1978 |
|
4251841 |
Jacobs |
Feb 1981 |
|
4356272 |
Kanemitsu et al. |
Oct 1982 |
|
Continuations (2)
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Number |
Date |
Country |
Parent |
575475 |
Jan 1984 |
|
Parent |
327371 |
Dec 1981 |
|