orthoclase is the type of substance that has the highest melting point.
orthoclase is the type of substance that has the highest melting point.
which type of substance has the highest melting point?
orthoclase
of all metals in pure form, tungsten has the highest melting point (3422 °c, 6192 °f), lowest vapor pressure (at temperatures above 1650 °c, 3000 °f), and the highest tensile strength. although carbon remains solid at higher temperatures than tungsten, carbon sublimes at atmospheric pressure instead of melting, so it has no melting point. tungsten has the lowest coefficient of thermal expansion of any pure metal. the low thermal expansion and high melting point and tensile strength of tungsten originate from strong covalent bonds formed between tungsten atoms by the 5d electrons.









































alloying small quantities of tungsten with steel greatly increases its toughness.
tungsten
unlike electroplated nickel, electroless nickel deposits do not have a precise melting point but rather have a melting "range". pure nickel has a melting point of 1455 °c (2650 °f), however en is an alloy and as the phosphorus content is increased within the film, the deposit begins to soften at lower temperatures and continues to soften until it eventually melts. the melting range decreases linearly as the phosphorus levels increase. the eutectic or lowest melting point for nip alloys is 880 °c (1620 °f) and occurs at a deposit phosphorus content of 11% b.w. the highest melting point is for low phosphorus deposits (less than 3%) that claim to have melting points at 1,200 °c (2,200 °f). en has failed in some high temperature applications since it was not fully recognized that even with a relatively high melting range the deposit may still have a liquid phase at lower temperatures. figure 3 illustrates what happens when you subject en to temperatures above its melting point.
electroless nickel