1. A method of producing a ceramic core usable in production of a turbine airfoil, comprising:
machining a workable material into a ceramic insert having at least one core making cavity;
increasing the durability of the ceramic insert;
forming a mold plate having at least one mold cavity configured to receive a ceramic insert;
installing the ceramic insert in the at least one mold cavity, wherein the ceramic insert includes the at least one core making cavity, and the mold plate forms at least a portion of a ceramic core mold; and
injecting a ceramic slurry into the ceramic core mold to create a ceramic core, wherein increasing the durability of the ceramic insert comprises converting a ceramic insert formed from graphite at least partially into silicon carbide.
2. The method of claim 1, wherein installing a ceramic insert in the at least one mold cavity comprises installing a ceramic insert formed from a reaction bonded metal oxide.
3. The method of claim 1, wherein increasing the durability of the ceramic insert comprises adding a coating formed from a chemical vapor deposition of silicon carbide into the ceramic insert.
4. The method of claim 1, wherein installing the ceramic insert in the at least one mold cavity comprises installing a ceramic insert formed from silicon carbide.
5. The method of claim 4, wherein installing the ceramic insert formed from silicon carbide comprises installing a ceramic insert having a coating formed from a chemical vapor deposition of a nonporous material.
6. The method of claim 5, wherein installing a ceramic insert formed from silicon carbide comprises installing a ceramic insert having a coating formed from a chemical vapor deposition of silicon carbide.
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. An anti-freeze faucet structure comprising:
an outer pipe including an inlet defined on a first end thereof to connect with a water pipe fitting, an outlet formed on a second end thereof, an opening arranged on the second end thereof adjacent to the outlet, an intake valve disposed on the second end thereof opposite to the opening, and a channel defined in the second end thereof and communicating with the inlet, the outlet, the opening and the intake valve, wherein the channel has plural inner threads proximate to the inlet;
an inner pipe inserted into the outer pipe and including a connecting segment and a fitting segment opposite to the connecting segment, wherein the connecting segment extends out of the opening of the outer pipe, the fitting segment has a peripheral protrusion arranged around an outer rim thereof, and the peripheral protrusion has a plurality of outer threads formed thereon and plural flow slots defined thereon and screwing with the plural inner threads of the outer pipe;
a control valve movably fitted on the fitting segment of the inner pipe to abut against and close the inlet of the outer pipe;
a resilient element fixed in the inner pipe adjacent to the fitting segment to push against the control valve;
a unidirectional sealing gasket fitted onto the inner pipe close to the fitting segment to limit water unidirectionally flows through the channel;
a controlling assembly disposed on the opening of the outer pipe and connecting with and driving the inner pipe to rotate, thus turning onoff the water.
2. The anti-freeze faucet structure as claimed in claim 1, wherein the inner pipe also includes an air tunnel arranged therein and a ventilation orifice defined on an outer wall thereof adjacent to the connecting segment and communicating with the air tunnel, and the ventilation orifice extends out of the opening of the outer pipe with the connecting segment.
3. The anti-freeze faucet structure as claimed in claim 1, wherein the inner pipe further includes a shoulder formed proximate to an inner rim of the fitting segment thereof and a locking flange mounted between the shoulder and the fitting segment, the control valve includes a plugging disc and an extending tube, a diameter of the extending tube is smaller than that of the plugging disc, the extending tube has a lock hook mounted on a first end thereof away from the plugging disc and plural slits extending from the first end thereof away from the plugging disc to a second end thereof close to the plugging disc, such that the extending tube flexibly retracts and expands and is inserted into the extending tube of the inner pipe, the lock hook of the extending tube is limited by the locking flange of the extending tube of the inner pipe, so a movement range of the extending tube is limited.
4. The anti-freeze faucet structure as claimed in claim 1, wherein the inner pipe includes a peripheral groove arranged around the outer wall thereof adjacent to the fitting segment to fit with the unidirectional sealing gasket.
5. The anti-freeze faucet structure as claimed in claim 1, wherein a diameter of the plugging disc is greater than that of inner pipe, the plugging disc has an O ring fitted on a first end thereof proximate to the extending tube and a seal washer fitted on a second end thereof away from the extending tube.
6. The anti-freeze faucet structure as claimed in claim 1, wherein the resilient element is a spring.
7. The anti-freeze faucet structure as claimed in claim 3, wherein the resilient element is fixed between the shoulder of the fitting segment of the inner pipe and the control valve, hence the resilient element pushes the control valve to the inlet of the outer pipe.
8. The anti-freeze faucet structure as claimed in claim 3, wherein the controlling assembly includes a rotary knob for connecting with the connecting segment of the inner pipe and for driving the inner pipe to rotate.