Powder metal alloy process
AssigneeStackpole Limited
InventorsRohith Shivanath, Peter Jones
Life of this patent
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Abstract
A process of forming a sintered article of powder metal comprising: selecting elemental iron powder; determining the desired properties of said sintered article and selecting, a quantity of carbon, and ferro alloy from the group of ferro manganese, ferro chromium, ferro molybdenum, ferro vanadium, ferro silicon and ferro boron; grinding said ferro alloy to a mean particle size of approximately 8 to 12 microns; introducing a lubricant while blending the carbon, ferro alloy, with said elemental iron powder; pressing the mixture to form the article; and then high temperature sintering the article at a temperature between 1,250.degree. C. and 1,350.degree. C. in a neutral or reducing atmosphere; so as to produce the sintered article of powdered metal; and includes the product formed thereby.
Claims17
A process of forming a sintered article of powder metal comprising;
- (a) blending
- (i) carbon,
- (ii) at least one ferro alloy powder selected from the group of separate ferro alloy particles of ferro manganese, ferro chromium, ferro molybdenum, ferro vanadium and ferro silicon
- (iii) lubricant with
- (iv) compressible iron powder,
- (b) pressing said blended mixture to form said article and
- (c) then high temperature sintering said article at a temperature of at least 1250.degree. C. in a reducing atmosphere.
A process of forming a sintered article of powder metal comprising.
- (a) blending
- (i) carbon,
- (ii) at least one ferro alloy powder selected from the group of separate ferro alloy particles of ferro manganese, ferro chromium, ferro molybdenum, ferro vanadium and ferro silicon
- (iii) lubricant with
- (iv) compressible iron powder,
- (b) pressing said blended mixture to form said article and
- (c) then high temperature sintering said article at, a temperature between 1250.degree. C. tp 1350.degree. C. under a vacuum.
A process of forming a sintered article of powder metal comprising:
- (a) selecting iron powder;
- (b) determining the desired properties of said sintered article and selecting;
- (i) a quantity of carbon;
- and
- (ii) at least one ferro alloy powder from the group of separate ferro alloy particles of ferro manganese, ferro chromium, ferro molybdenum, ferro vanadium and ferro silicon and selecting the quantity of same so as to control said desired properties of said sintered article;
- (c) grinding separately each said ferro alloy powder to a mean particle size of approximately 8 to 12 microns and substantially all of said ferro alloy powder having a particle size of less than 25 microns;
- (d) introducing a lubricant while blending said carbon, and ferro alloy powder with said iron powder;
- (e) pressing said mixture to form said article;
- (f) high temperature sintering said article at a temperature of at least 1,250.degree. C. in a reducing atmosphere of 90% blended nitrogen and 10% hydrogen;
- so as to produce said sintered article of powdered metal.
Dependencies are inferred from the claim text.