| 摘要 |
A method for manufacturing a protection sleeve and a protection sleeve as manufactured accorcling to the method for equipment for testing or test sampling liquid metal by introducing the protection sleeve (3; 3 min ; 3 sec ) together with a testing or sampling means (2; 11) provided inside the protection sleeve into the liquid metal (1), whereby the protection sleeve provides a controlled and predeterminable flow of metal at least at or adjacent the walls of the protection sleeve. The protection sleeve comprises a thermoinsulating tube (3; 3 min ; 3 sec ) made of synthetic amorphous mineral fibres, preferably fibres of diabase type and having a sagging point of 1000-1200 DEG C according to the standards of the Swedish Institute for Materials Testing, and bound with an evenly distributed binder comprising or including among other things a binder component of organic type, for instance a thermosetting resin like phenol resin, carbomide resin or melamine resin and or substances incorporated in the fibre material, for instance crystal water containing salts or carbonates which at the temperature of the liquid metal spontaneously and successively emit gases. The mineral fibre tube (3; 3 min ; 3 sec ) can be manufactured from mineral fibres having an original weight per unit of volume of 20-70 kg/m<3>, which have been compressed to a weight per unit of volume of 200-800 or preferably 500-700 kg/m<3>. Preferably the binder is added in an amount of 2-8% by weight. The intensity of the turbulent flow is controlled by varying the amount of binder in the thermoinsulating mineral fibre tune and/or by varying the hardness of the mineral fibre tube. |
