High-temperature gradient directional solidification conical graphite induction heater

Abstract

The invention relates to a high-temperature gradient directional solidification conical graphite induction heater which comprises a conical high-frequency induction coil (7) and a conical heating body (1). A straight cylinder is arranged at the small diameter end of the heating body (1), and the small diameter end of the heating body (1) is arranged on a radiation baffle (3); one end of a crucible (6) penetrates through a middle hole of the radiation baffle (3) to be connected with a pulling system (9), and the other end is arranged in the heating body (1); and the high-frequency induction coil (7) is sleeved outside the heating body (1) to be connected with a high-frequency induction power supply (10). The high-temperature gradient directional solidification conical graphite induction heater uses the small diameter end of the heating body to intensively and emphatically heat a melting interface of a sample and limits overheating within a small area at the front edge of the interface so as to prevent the corundum crucible in the directional solidification process from being damaged due to durable overheating, shorten the distance between the highest temperature area and the solidifying interface and improve the temperature grads of the front edge of the solid / liquid interface, thereby improving the material texture and the comprehensive performance of the material and being suitable for large-size directional solidification samples.

Description

1. Technical field [0001] The invention relates to a technique for obtaining high temperature gradient of directional solidification, in particular to a conical graphite induction heater for directional solidification with high temperature gradient. 2. Background technology [0002] The development of aviation gas turbine engines has always relied on the development of superalloys, and the application of directional solidification technology is a milestone in the development of superalloys, which brings the manufacturing technology of superalloys into a new era. The superalloy gas turbine engine blade with columnar or even single crystal structure prepared by directional technology has excellent thermal shock resistance, long fatigue performance, high creep resistance and medium temperature plasticity, thus improving the blade service life and operating temperature. During the directional solidification process, the temperature gradient of the liquid phase at the front of t...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the low temperature gradient of the current graphite heating and directional solidification device and the limited mechanical properties of the produced samples, the present invention proposes a high temperature gradient directional solidification conical graphite induction heater

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