Deoxidising agents for Copper & Copper based alloys. D.O.TUBES are individual copper based tubes containing a variety of reagents. D.O.TUBES are specially designed to remove dissolved oxygen formed during the melting process. If this dissolved gas is allowed to remain in the melt it can seriously reduce mechanical properties and pressure tightness of the casting. Thus, D.O.Tubes are used to maintain the mechanical properties and reduce rejections due to defects.
Upon completion of the melting process using the appropriate covering and cleaning agents, the melt should be deoxidised to remove dissolved oxygen.
It is most important that the slag is completely removed (specially in the case of oxidising slags) before treatment with D.O.TUBES in order to prevent a reaction between the deoxidising agent and oxygen contained in the slag.
D.O.TUBES should be plunged quickly down to the bottom of the melt using a forked plunging rod and kept there until the reaction is complete.
TYPES OF DO TUBES
1. Magnesium Based (DO Tubes MG)
2. Phosphorus Based (DO Tubes P)
3. Calcium Based (DO Tubes Ca)
4. Lithium Based (DO Tubes Li)
5. Calcium Hexaboride Based (DO Tubes CB)
Type of Deoxidizer & Dosage to be used depends on various factors such as type of Copper alloy being casted, temperature being maintained, and requirements of Mechanical & Physical Properties from that alloy. Conductivity required out of the end product being casted and many more.
Commercial Available sizes starts from 10 Grams per Tube to 50 Grams per Tube packed in Brass / Copper Sheets.