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Manufacturing method of diaphragm for speaker

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TLDR
In this paper, a diaphragm for a speaker is set into a high temperature high pressure processing device, a cover is closed and the inside of the device is evacuated, the inside device is replaced by a special pressure nitrogen gas, and next, a special high-pressure nitrogen gas is filled and a temperature up is executed.
Abstract
PURPOSE:To obtain a TiN (titannitride) layer with high elastic ratio at a surface by processing, with high temperature and high pressure, a titanium foil and a titanium alloy foil molded to a dome-shaped diaphragm shape, in a nitrogen gas atmosphere beforehand. CONSTITUTION:This material using a titanium alloy foil is molded to a dome-shaped diaphragm shape beforehand. Next, a surface at a titanium diaphragm is cleaned with an ultrasonic wave by fleon solution and an oily dust, etc., which are stuck at the surface, are removed. After that, after a diaphragm for a speaker is set into a high temperature high pressure processing device, a cover is closed and the inside of the device is evacuated, the inside of the device is replaced by a special pressure nitrogen gas and next, a special high pressure nitrogen gas is filled and a temperature up is executed. After preservation is executed by a special high temperature for a special time, temperature descends and pressure decreases and a processed body is removed. A process parameter of high temperature and high pressure processing by the method is shown in a figure. As shown in the figure by processing of the method, TiN (titannitride) layers 2 and 3 of a special thickness are formed at the surface of the titanium diaphragm 1, and a diaphragm with very high surface hardness and high elasticity can be obtained.

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Manufacture of loudspeaker diaphragm

TL;DR: In this article, a diaphragm is formed on the surface of a titanium foil by executing a vacuum suction, raising a temperature in a ratio of 10 deg.C/min, leading nitrogen gas into a furnace as soon as a temperature reaches 820 deg.