Powder metallurgy of common sense (1)

1.What is powder metallurgy?
Powder metallurgy is a manufacturer of metal powders and metal powder (sometimes also add a small amount of non-metallic powder) as raw materials, mixing, shaping and sintering of manufacturing technology of materials or products. It consists of two parts, namely:

(1) manufacture of metal powders (including alloy powders, hereafter referred to as “metallic powder”).
(2)metal powder (sometimes also add a small amount of non-metallic powder) as raw materials, mixing, shaping and sintering of materials (called “powder metallurgy materials”) or products (known as “the powder metallurgy product”).

2. what is the advantage of powder metallurgy?
There are two the most prominent advantage of powder metallurgy .
1)capable of manufacturing other processes cannot be manufactured or hard to manufacture materials and products.Such as the materials and products of porous, sweat, shock absorption and sound insulation , refractory metals such as tungsten, molybdenum, titanium, and products, metal-plastic, bi-metal, composite materials and products
2) can be produced desirable products directly or close to finished size requirements, so as to reduce or eliminate mechanical processing, the material utilization ratio can be as high as 95%, also replacing copper with iron in some products, to achieve a “cost saving, energy-saving”.

3. what is the “iron”? What is iron-based powder metallurgy?
Iron base refers to the composition of the material is iron-matrix. Iron-based powder metallurgy is a sintered (including powder forging), manufactured with iron as its main component of powder metallurgy materials and products (iron machine parts, antifriction materials, friction materials, and other iron-based powder metallurgy materials) processes collectively.
The process performance of powder metallurgy include the following five points:
(1) bulk density;
(2) tap density;
(3) liquidity;
(4) compression;
(5) the formability.

4.How many mainly types of method that use for the powder production of powder injection molding?
There are two methods of manufacturing Powder which are physical-chemical and mechanical crushing .Including restore , and method of electrolysis and carbonyl groups, which include grinding and spray .

5.What’s the method of reduction about manufacturing
metal injection molding
Which is reducing the metal oxide with the oxygen captured out to obtain ,than producing metal powder.

6.What is the reducing agent?
The reducing agent is the ability to capture oxygen in the oxide material.Preparing metal powder of the reducing agent is a metal oxide that can remove oxygen in the material.
The metal oxide is concerned, all the oxygen which is greater than the affinity of the metal and oxygen affinity substance are referred to as the metal oxide reducing agent.

7.What is the purpose of the powder is annealed to restore?
The main purpose of the reduction annealing the powder has the following three aspects:
(1)removing the oxide film of the metal powder particle surface;
(2) to remove adsorbed gases and particulate foreign matter such as water;
(3) elimination of hardening particles.

8.What are these about performance measurement of powder metallurgy?
There are three ways of performance measurement for powder metallurgy: chemical composition, physical properties and process performance.

9.The physical properties of the powder for powder metallurgy that includes several?
The physical properties of the powder metallurgy used to include the following three items:
(1) The particle shape of the powder;
(2) the powder particle size and size distribution;
(3) a powder surface area.

10.what is the performance of powder metallurgy for powder technology?
Powder metallurgy of powder process performance,including the following five :
(1) bulk density;
(2) Tap density;
(3) liquidity;
(4) compression;
(5) formability.