Abstract: The invention provides a plunger tip for die casting machines which is excellent in slidability and sealing properties. The plunger tip comprises a tip main body (20) and is slidable inside a plunger sleeve (60) for pushing out a molten metal into a die. The tip main body (20) is made of a metal material and covered over an outer peripheral surface thereof with a slide sleeve (40) made of a rigid resin material exhibiting high slidability and excellent sealing properties on the inner surface of the plunger sleeve.

Abstract: The invention provides a plunger sleeve for use in die casting machines which is outstanding in heat insulating and heat-retaining properties and which is capable of suppressing the drop in the temperature of molten nonferrous metal to the greatest extent and maintaining a stabilized casting operation under pressure. The plunger sleeve comprises a first metal layer made of a metal having high heat resistance and forming the inner periphery of the sleeve, a second metal layer providing the outer periphery of the sleeve, and a ceramic layer formed between the first metal layer and the second metal layer. The ceramic layer comprises a ceramic powder and/or a ceramic fiber consolidated to at least 50% to not greater than 90% in relative density.

Abstract: The invention provides a plunger tip for die casting machines which is excellent in slidability and sealing properties. The plunger tip comprises a tip main body (20) and is slidable inside a plunger sleeve (60) for pushing out a molten metal into a die. The tip main body (20) is made of a metal material and covered over an outer peripheral surface thereof with a slide sleeve (40) made of a rigid resin material exhibiting high slidability and excellent sealing properties on the inner surface of the plunger sleeve.

Abstract: A composite sintered material of a mixed-phase structure comprising fine particles of hard compound compactly and uniformly dispersed in grains of matrix of titanium or titanium alloy. The material is outstanding in abrasion resistance, strength, toughness, etc., and also has high resistance to corrosion by molten nonferrous metals and is therefore reduced in the likelihood of dissolving out into the melt.The sintered material is produced by uniformly mixing together a metal powder for forming the matrix of the desired sintered material and a powder for forming particles of hard compound to be dispersed, molding the powder mixture into a block under pressure, atomizing the block while melting the block and sintering the resulting powder.

Abstract: A heat-resistant material having excellent high-temperature strength and high oxidation resistance at temperatures exceeding 1300.degree. C. The material is a heat-resistant Cr-Fe alloy including at least 60% of Cr and at least 5% of Fe, and having a mean grain size of at least 50 .mu.m and having a melting point of at least 1600 .degree. C., or a composite material composed of the said heat-resistant alloy serving as a metal matrix and a ceramic, and containing up to 40% by volume of a dispersed ceramic phase in the metal matrix.