CN101609751A - Nano-doping stannic oxide powder and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of nano-doping stannic oxide powder, be doped with the titanium that accounts for total weight 1.6% in the stannic oxide powder.Its preparation method is: take by weighing SnCl ₄5H ₂O and TiCl ₄, the ratio of its weight portion is 35.1: 1; With SnCl ₄5H ₂O, TiCl ₄With absolute ethyl alcohol, distilled water and polyethylene glycol, pour abundant stirring and dissolving in the beaker into; Intensification constant temperature stirs half an hour; Slowly splash into ammoniacal liquor then until forming gel; Adopt deionized water wash till no Cl ion exists, gel drying is obtained xerogel, calcine at last, obtain SnO ₂Fine powder.The present invention passes through at SnO ₂Mix metal element Ti in the lattice, and adopt sol-gel process to make nano level SnO ₂Powder has improved SnO ₂The electric conductivity of powder is for overcoming siller tin oxide electric contact material because of SnO ₂The fast shortcoming of contact resistance height, temperature rise that poor electric conductivity causes provides a kind of effective ways.SnO after mixing ₂Powder, conductivity reaches 4 * 10 ^-3Ω ^-1m ^-1

Description

Nano-doping stannic oxide powder and preparation method thereof

Technical field

The present invention relates to a kind of electric equipment material, relate in particular to a kind of electrical contact material;

The invention still further relates to a kind of electric equipment preparation methods, relate in particular to a kind of preparation method of electrical contact material.

Background technology

The quality of electrical contact material performance directly has influence on reliability of operation and useful lifes such as all kinds of switches, relay, contactor.Desirable contact material should possess good physical property, mechanical performance, chemical property, electrical contact performance and welding performance.Using more in the past is silver cadmium oxide material, but Agcdo has certain toxicity, and its application progressively is restricted.

Siller tin oxide electric contact material is a kind of non-toxic material that development in recent years is got up, and having Heat stability is good, anti-electric arc etch and resistance fusion welding can wait advantage well, is the novel nontoxic slider material that is hopeful to substitute Agcdo most.

Yet people find that in silver tin oxide material Application and Development for many years siller tin oxide has some fatal deficiency, and wherein more of paramount importance is exactly that contact resistance is big, and temperature rise is higher, and this becomes the key of siller tin oxide electric contact material Application and Development

A large amount of failure analyses to sliver oxidized tin contactor materials show, the main cause that contact resistance is high is that contact surface constantly forms due to the non-conductive SnO2 slag blanket through after the make-break operation repeatedly, and common pure SnO2 conductivity is about 1.35 * 10 ^-5Ω ^-1m ^-1Therefore, improving the electric conductivity of tin oxide, is the important channel that addresses the above problem.

Summary of the invention

Technical problem to be solved by this invention provides the electrical contact SnO that a kind of contact resistance is little, conduct electricity very well ₂Material and preparation method thereof, the SnO that makes ₂Material electric conductivity height, long service life.

As follows for solving the problems of the technologies described above the technical solution adopted in the present invention:

A kind of nano-doping stannic oxide powder is doped with the titanium that accounts for total weight 1.6% (promptly the molecular amounts of titanium is mixed than being 5% in this nano-doping stannic oxide powder) in the stannic oxide powder.

The present invention also provides a kind of preparation method of above-mentioned stannic oxide powder simultaneously,

A. take by weighing SnCl ₄5H ₂O and TiCl ₄, the ratio of its weight portion is 35.1: 1;

B. with SnCl ₄5H ₂O, TiCl ₄With absolute ethyl alcohol, distilled water and the polyethylene glycol of effective dose, pour in the beaker and fully stir, make SnCl ₄5H ₂O, TiCl ₄Fully dissolving;

C. after being warmed up to 60 degree, constant temperature stirs half an hour; Slowly splash into ammoniacal liquor then, until forming the transparent gel of white;

D. adopt deionized water wash till no Cl ion exists,

E. gel is dry under 58 ℃～60 ℃ temperature, obtain xerogel, to calcine at last, calcining heat is 445 ℃～450 ℃, obtains SnO ₂Fine powder.

The present invention passes through at SnO ₂Mix metal element Ti in the lattice, and adopt sol-gel process to make nano level SnO ₂Powder has improved SnO ₂The electric conductivity of powder is for overcoming siller tin oxide electric contact material because of SnO ₂The fast shortcoming of contact resistance height, temperature rise that poor electric conductivity causes provides a kind of effective ways.SnO after mixing ₂Powder, conductivity reaches 4 * 10 ^-3Ω ^-1m ^-1And the electrical contact longer service life made of this material.

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 nano-doping stannic oxide powder preparation method of the present invention flow chart.

Embodiment

A kind of nano-doping stannic oxide powder is doped with the titanium that accounts for total weight 1.6% in the stannic oxide powder, the molecular amounts that promptly is equivalent to titanium in this nano-doping stannic oxide powder is mixed than being 5%.

As shown in Figure 1, the preparation method of this nano-doping stannic oxide powder is as follows:

A. take by weighing SnCl ₄5H ₂O and TiCl ₄, the ratio of its weight portion is 35.1: 1;

B. with SnCl ₄5H ₂O, TiCl ₄With an amount of absolute ethyl alcohol, distilled water and polyethylene glycol, pour in the beaker and fully stir, make SnCl ₄5H ₂O, TiCl ₄Fully dissolving;

C. after being warmed up to 60 ℃, constant temperature stirs half an hour; Slowly splash into ammoniacal liquor then, until forming the transparent gel of white;

D. adopt deionized water wash till no Cl ion exists,

E. gel is dry under 58 ℃～60 ℃ temperature, obtain xerogel, to calcine at last, calcining heat is 445 ℃～450 ℃, obtains SnO ₂Fine powder.

The nano-doping stannic oxide powder particle diameter that detection obtains obtaining reaches 35nm～50nm, and conductivity is 3.5 * 10 ^-3Ω ^-1m ^-1～4.5 * 10 ^-3Ω ^-1m ^-1

Above-mentioned relevant parameter such as following table:

Embodiment	Gel drying temperature ℃	Calcining heat ℃	Conductivity Ω -1m -1
				??1	??58	??445	??3.5×10 -3
??2	??59	??450	??4.3×10 -3
				??3	??60	??448	??4.5×10 -3

Claims (2)

1. a nano-doping stannic oxide powder is characterized in that: be doped with the titanium that accounts for total weight 1.6% in the stannic oxide powder.

2. the preparation method of an above-mentioned stannic oxide powder is characterized in that:

A. take by weighing SnCl ₄5H ₂O and TiCl ₄, the ratio of its weight portion is 35.1: 1;

B. with SnCl ₄5H ₂O, TiCl ₄With absolute ethyl alcohol, distilled water and the polyethylene glycol of effective dose, pour in the beaker and fully stir, make SnCl ₄5H ₂O, TiCl ₄Fully dissolving;

C. after being warmed up to 60 ℃, constant temperature stirs half an hour; Slowly splash into ammoniacal liquor then, until forming the transparent gel of white;

D. adopt deionized water wash till no Cl ion exists;

E. gel is dry under 58 ℃～60 ℃ temperature, obtain xerogel, to calcine at last, calcining heat is 445 ℃～450 ℃, obtains SnO ₂Fine powder.

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