Heat treatment furnace and its temp.-controlling method

Abstract

The present invention provides a heat treatment furnack, including furnace cover, furnace heating plate, heat-insulating layer, furnace shell, working table, sealing ring and turning shaft. The superconducting material to be treated is placed on the tray, and the internal temp. of the furnace can be controlled by adopting sectional and partitioning control method, so that the temp. of interior offurnace body can be retained uniformly, and the superconducting wires with different length can be simultaneously undergone the process of heat treatment. Said furnace body is easy to maintain, and its operation is simple and convenient.

Description

technical field [0001] The invention relates to a novel heat treatment furnace, in particular to a heat treatment furnace for preparing high-temperature superconducting wires and a temperature control method thereof. The method can be used to precisely control the temperature in the furnace, thereby improving the electrical and mechanical properties of the prepared high-temperature superconducting wire. Background technique [0002] The preparation of high-temperature superconducting wire generally requires a heat treatment process, which plays a key role in the entire preparation process and can greatly improve the performance of the material. A typical bismuth-based high-temperature superconducting wire is prepared by filling a Bi-based oxide powder with an Ag sleeve, referred to as the PIT method. This method usually includes powder filling, drawing, rolling, heat treatment, testing and other processes. [0003] 1. Powder filling is to put Bi, Sr, Ca, Cu and other metal...

AI Technical Summary

Problems solved by technology

Convection is necessarily high in a chamber furnace large enough to accommodate long superconducting wires, and it will be very difficult to maintain a stable, uniform temperature zone in the furnace

In addition to the common disadvantage of taking and placing the wires, all kinds of ring furnaces also have their own problems in temperature control.

People such as Alexandrov proposed a kind of annular furnace in U.S. Patent No. 4,812,608, and the axial cross-section of its inner reaction chamber is very large with respect to the radius of furnace body, makes it difficult to provide accurate in such a large reaction chamber. temperature control

Ikegami et al. proposed another annular furnace in U.S. Patent No. 4,497,674, which has a large diameter and allows continuous passage of the silver ribbon. The movement of the silver ribbon through the furnace and the presence of multiple apertures in the chamber increase the The magnitude of convection significantly disrupts the temperature distribution in the furnace, making it difficult to maintain high-precision temperature control in such a furnace

The annular furnace proposed by Sushll et al. in U.S. Patent No. 5,783,141 only has heating plates in the longitudinal direction to control the temperature in the furnace. This furnace is also difficult to ensure that the temperature in the entire furnace is uniform

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