Kovar 已經用咗好幾十年，佢話 : 「我哋都係喺呢度啦 ! 」。. 儘管歷史相對較長, 工程領域以外嘅好多人可能從來都冇聽過呢個寶貴嘅合金. 呢個係 kovar 嘅概覽.
科瓦個名其實係由特拉瓦州公司商標, CRS 控股, Inc. 科瓦爾係美國首次專利. 係 1936. The alloy itself is made from iron, 鎳, and cobalt.
The uniqueness of Kovar, and thus its importance, is that it has a coefficient of thermal expansion that is remarkably similar to borosilicate glass (hard glass) or ceramic. This alloy’s coefficient of thermal expansion is not an accident. Kovar was, in fact, carefully formulated to meet a specific need.
The challenge with pairing metal to glass is that each has a different coefficient of thermal expansion. The problem is that as the glass and metal are heated or cooled they expand and contract at different rates and in varying amounts. Consequently, the hermetic seal between metal and glass components may be destroyed, or the glass may be broken, when the two are paired together and there is a change in temperature.
One common, everyday example of the need for an alloy that can be safely paired with glass is light bulbs. A light bulb made with a base that has a different coefficient of thermal expansion from glass would break quickly due to the heat that the bulb produces while in use. Kovar solves this problem because the alloy base and the glass bulb expand and contact at nearly the same rate.
Light bulbs are perhaps the most common example of the use of Kovar, but this alloy is used in many different products. Kovar is also used to manufacture x-ray tubes, 微波管, 二極管, 晶體管, 同更多.
Kovar may not be a household name, but this incredible alloy is still used in products in every home.
Eagle Alloys Corporation has been in the metal business for more than 30 年. We are able to offer solutions to your material needs. Contact us today to learn more about our products or to place your order.
