CN102162045A - Electrical contact based on powdered copper and manufacturing process thereof - Google Patents

Abstract

The invention provides an electrical contact based on powdered copper and a preparation process thereof. The electrical contact based on the powdered copper is prepared from the following materials in percentage by weight: 0.3 to 7 percent of nickel, 0.1 to 6 percent of boron, 0.1 to 8 percent of tungsten, 0.2 to 10 percent of graphite, 1 to 7 percent of titanium, 0.1 to 6 percent of molybdenum, 0.1 to 8 percent of diamond, 0.2 to 7 percent of lanthanum, 0.5 to 9 percent of aluminum, 0.5 to 8 percent of niobium, 0.1 to 5 percent of silicon, 0.1 to 6 percent of yttrium, 0.1 to 6 percent of chromium, 0.1 to 5 percent of cerium, and the balance of copper powder. The preparation process comprises the steps of mixing, cold pressing and sintering. In the preparation process, a general silver alloy contact is replaced by copper, so that the cost of silver alloy contacts of electric switches is reduced. The electrical contact based on the powered copper has high electrical performance and mechanical properties, and is a cheap substitute product of silver alloy materials of electrical contacts of low-voltage electric switches.

Description

Powder copper base electric contact and manufacturing process thereof

Technical field

The invention belongs to field of metallurgy, be specifically related to a kind of powder copper base electric contact composite material that is used for low-voltage apparatus, also relate to the manufacturing process of this powder copper base electric contact simultaneously.

Background technology

Electrical contact as low-voltage apparatus key element, on security that ensures low-voltage apparatus and reliability, play a significant role.Therefore, to having relatively high expectations of electrical contact material, qualified electrical contact material should possess low good guide performance of long, shock-resistant, corrosion-resistant, resistance of life-span and easy physicals such as welding processing.For guaranteeing the reliability of electrical contact work, big multiaction precious metal such as silver and alloy material thereof are made both at home and abroad.But, be difficult on the low voltage electrical equipment and use on a large scale because precious metal silver costs an arm and a leg, resource-constrained.In order to save production cost, to economize on resources and environmental protection requirement, need to seek a kind of equivalent material that meets low-voltage apparatus electrical contact performance requriements.

Summary of the invention

The purpose of this invention is to provide a kind of aboundresources, cheap and long service life, shock-resistant, corrosion-resistant, anti-oxidant, powder copper base electric contact composite material that resistance is low.Simultaneously, the present invention also provides the preparation technology of this powder copper base electric contact.

The technical solution adopted in the present invention is as follows:

A kind of powder copper base electric contact forms (weight percent) by following material preparation:

Nickel 0.3-7%, boron 0.1-6%, tungsten 0.1-8%, graphite 0.2-10%,

Titanium 1-7%, molybdenum 0.1-6%, diamond 0.1-8%, lanthanum 0.2-7%,

Aluminium 0.5-9%, niobium 0.5-8%, silicon 0.1-5%, yttrium 0.1-6%,

Chromium 0.1-6%, cerium 0.1-5%, surplus is a copper powder.

As a further improvement on the present invention, described powder copper base electric contact forms (weight percent) by following material preparation:

Nickel 0.3%, boron 0.15%, tungsten 0.1%, graphite 0.25%,

Titanium 2%, molybdenum 0.15%, diamond 0.2%, lanthanum 0.3%,

Aluminium 0.5%, niobium 0.5%, silicon 0.15%, yttrium 0.1%,

Chromium 0.13%, cerium 0.2%, surplus is a copper powder.

The manufacturing process of powder copper base electric contact of the present invention specifically may further comprise the steps:

(1) taking by weighing raw material rolled 2 hours in high energy mixing drum machine is mixed;

(2) go into and be pressed into original shape with 350 tons of oil presses in the model, put into 1 hour postcooling of 850 ℃ of sintering of high-temperature vacuum furnace again;

(3) become required specification by annealing steel rolling, become the contact shape with stamping machine.

Beneficial effect of the present invention is: the price of material is low, practical on the low-voltage apparatus switch, strong, wear-resisting, the anti-corruption of the low segmentation ability of resistance is decreased, electric arc is little, the life-span is long, solved the high problem of price of precious metal silver, reduced the cost of electric switch silver contact far away, this invention replaces general silver cadmium oxide contact, material price is cheap, be received by the market very much, used customer response very good, and qualified by the authoritative detection 25Kv of department disjunction.

The present invention replaces general silver alloys contact with copper, material therefor low price and aboundresources, thus reduced the cost of electric switch silver alloys contact.Electrical contact of the present invention and good electric property is arranged and mechanical property such as corrosion-resistant, resistance to oxidation, anti-mechanical shock, hardness height, life-span is long in actual use, close with Ag-ZnO material electrical contact performance, be the cheap substitute products of low-voltage apparatus electrical contact silver alloy.

Among the preparation technology of powder copper base electric contact of the present invention equipment there is not particular requirement, the preparation process compliance with environmental protection requirements.

Embodiment

Embodiment 1:

Take by weighing raw material by weight percentage: nickel 0.3%, boron 0.15%, tungsten 0.1%, graphite 0.25%, titanium 2%, molybdenum 0.15%, diamond 0.2%, lanthanum 0.3%, aluminium 0.5%, niobium 0.5%, silicon 0.15%, yttrium 0.1%, chromium 0.13%, cerium 0.2%, surplus is a copper powder.Earlier optimum value is mixed with copper powder, with high energy mixing drum machine carry out mixing in 2 hours roll after, again with the powdered alloy that mixes, the 4kg powder is put into model and is pressed into shallow lake, garden shape with the 350T oil press, put into the cooling in 1 hour of 850 ℃ of sintering of high-temperature vacuum furnace again, come out of the stove and push integer with the 350T oil press again, put into the high-temperature vacuum furnace sintered heat insulating once more 1 hour.Coming out of the stove directly is pressed into the sheet material shape with the 650T extrusion machine, becomes required specification by annealing steel rolling again, becomes the contact shape with stamping machine.

The powder copper base electric contact performance of making is as follows:

Density 8.3g/cm

Resistivity 2.4G Ω cm

Hardness 40～60 (Hv)

Embodiment 2:

Take by weighing raw material by weight percentage: nickel 0.3%, boron 0.1%, tungsten 0.1%, graphite 0.2%, titanium 1%, manganese 0.1%, diamond 0.1%, lanthanum 0.2%, aluminium 0.5%, niobium 0.5%, silicon 0.1%, yttrium 0.1%, chromium 0.1%, copper 96.4% mixes in high energy mixing drum machine, and mixing the time of rolling is 2 hours.Reenter in the model and suppress, put into 1 hour postcooling of 850 ℃ of sintering of high-temperature vacuum furnace again with 350 tons of oil presses.Become required specification by annealing steel rolling, become the contact shape, make the powder copper base electric contact with stamping machine.

The powder copper base electric contact performance of making is as follows:

Density 8.3g/cm

Resistivity 2.4G Ω cm

Hardness 40～60 (Hv)

Embodiment 3:

Take by weighing raw material by weight percentage: nickel 6%, boron 4%, tungsten 7%, carbon 8%, titanium 7%, manganese 6%, Tungsten oxide 99.999 8%, lanthanum 7%, aluminium 7%, niobium 6%, silicon 5%, yttrium 6%, cadmium 6%, copper 27% mixes in high energy mixing drum machine, and mixing the time of rolling is 2 hours.Reenter in the model and suppress, put into 1 hour postcooling of 850 ℃ of sintering of high-temperature vacuum furnace again with 350 tons of oil presses.Become required specification by annealing steel rolling, become the contact shape, make the powder copper base electric contact with stamping machine.

The powder copper base electric contact performance of making is as follows:

Density 8.3g/cm

Resistivity 2.4G Ω cm

Hardness 40～60 (Hv)

Claims (3)

1. powder copper base electric contact is characterized in that this powder copper base electric contact is formed by the material preparation of following weight per-cent:

Nickel 0.3-7%, boron 0.1-6%, tungsten 0.1-8%, graphite 0.2-10%,

Titanium 1-7%, molybdenum 0.1-6%, diamond 0.1-8%, lanthanum 0.2-7%,

Aluminium 0.5-9%, niobium 0.5-8%, silicon 0.1-5%, yttrium 0.1-6%,

Chromium 0.1-6%, cerium 0.1-5%, surplus is a copper powder.

2. according to the described a kind of powder copper base electric contact of claim 1, it is characterized in that this powder copper base electric contact is formed by the material preparation of following weight per-cent:

Nickel 0.3%, boron 0.15%, tungsten 0.1%, graphite 0.25%,

Titanium 2%, molybdenum 0.15%, diamond 0.2%, lanthanum 0.3%,

Aluminium 0.5%, niobium 0.5%, silicon 0.15%, yttrium 0.1%,

Chromium 0.13%, cerium 0.2%, surplus is a copper powder.

3. according to the manufacturing process of claim 1 or 2 described a kind of powder copper base electric contacts, it is characterized in that may further comprise the steps:

(1) taking by weighing raw material rolled 2 hours in high energy mixing drum machine is mixed;

(2) go into and be pressed into original shape with 350 tons of oil presses in the model, put into 1 hour postcooling of 850 ℃ of sintering of high-temperature vacuum furnace again;

(3) become required specification by annealing steel rolling, become the contact shape with stamping machine.