Silicon nitride heat generator and manufacturing method thereof

Abstract

The invention provides a silicon nitride heat generator and a manufacturing method thereof. The silicon nitride heat generator comprises a heat generating source and a heat generating main body, wherein the heat generating source is a tungsten filament; the heat generating main body is prepared from the following components in part by weight: 88-92 parts of silicon nitride, 6.5-8.5 parts of aluminum oxide and 1.5-3.5 parts of yttrium oxide. The invention has the advantages that the manufacture processing is simple, and the operation process is easy to control; the silicon nitride heat generator manufactured by the method has higher qualified rate of the finished product, higher heat conducting property and higher heat efficiency; and the silicon nitride also has good thermal shock property.

Description

technical field [0001] The invention relates to electrothermal materials, in particular to a silicon nitride heating element and a manufacturing method thereof. Background technique [0002] At present, instant electric water heaters and instant faucets using silicon nitride as a heating element have been supplied in the domestic market. Compared with gas water heaters and storage-type electric water heaters, instant electric water heaters have the advantages of rapid heating, sustainable hot water supply, small size, safety and environmental protection. The silicon nitride heating element heats up quickly and can be used continuously without waiting, so the water usage rate is almost 100%, which saves electricity and energy, and the heating pipe is not easy to scale and has a longer service life. [0003] The existing silicon nitride heating element is usually a one-time sintered heating element. For example, a silicon nitride heating element and its manufacturing method a...

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Problems solved by technology

[0004] At present, there are two ways to make silicon nitride heating elements: one is to embed electric heating wires in silicon nitride powder, and then sinter them in a mold at one time. The silicon nitride heating elements produced by this process are easy to form sintering. Stress, high defect rate during production, and easy to break during use

Another processing method is to print an electric heating film on the surface of the soft silicon nitride raw material, and then sinter it to form a silicon nitride ceramic heating element. When the silicon nitride raw material and the electric heating film are co-fired, the atmosphere is difficult to control. low pass rate

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