W-Cu composite powder with high thermal conductivity and low thermal expansion coefficient and preparation method thereof
A low thermal expansion coefficient, composite powder technology, applied in the direction of semiconductor devices, semiconductor/solid-state device parts, electric solid-state devices, etc., can solve the problem of W and Cu immiscible wettability, unfavorable material physical properties, and difficult mass production To achieve the effect of improving density and physical properties, less agglomeration, and reducing thermal expansion coefficient
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[0026] Example 1
[0027] Preparation of high thermal conductivity and low thermal expansion coefficient W-CU composite powder is as follows:
[0028] Step 1: Preparation of the front drive
[0029] Pasteneate (AMT, ALADDIN, purity ≥99.95%) and copper (Cu (NO) 3 ) 2 · 3h 2 O, ALADDIN, purity ≥ 99.5%) Dissolve in deionized water, heating and stirring to obtain a mixed solution, and the like is transparent to oxalic acid (C 2 Hide 2 O 4 · 2h 2 O, analyze pure), the precipitate obtained by stirring the mixed solution to dry the W-CU precursor.
[0030] Among them, the amount of copper-nitrate and oxalic acid is 70.41%, 39%, respectively.
[0031] Step 2: Hydrogen reduction
[0032] The block front-shaped body obtained in step 1 is fully grinding the fine powder in the mortar, and the burning boat placed in a fine powder is placed in hydrogen (hydrogen gas purity ≥99.999%) to reduce the furnace for three-step reduction: first rose the temperature to 400 ° C, for 30 min, so that the re...
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[0039] Example 2
[0040] High thermal conductivity, a low thermal expansion coefficient of the chemical preparation of W-Cu composite powders is as follows:
[0041] Step 1: Preparation of the front drive
[0042] Pasteneate (AMT, ALADDIN, purity ≥99.95%) and copper (Cu (NO) 3 ) 2 · 3h 2 O, ALADDIN, purity ≥ 99.5%) Dissolve in deionized water, heating and stirring to obtain a mixed solution, and the like is transparent to oxalic acid (C 2 Hide 2 O 4 · 2h 2 O, analyze pure), the precipitate obtained by stirring the mixed solution to dry the W-CU precursor.
[0043] Wherein the amount of added copper nitrate and oxalic acid were 31.29% by mass of ammonium metatungstate, 38%.
[0044] Step 2: Hydrogen reduction
[0045] The finely ground bulk precursor obtained in Step 1 in a mortar to a fine powder, the powder has a burning boat containing into hydrogen (hydrogen purity ≥99.999%) reduction furnace for reduction of three steps: First, the temperature was raised to 380 ℃, incubated 2...
Example Embodiment
[0049] Example 3
[0050] Preparation of high thermal conductivity and low thermal expansion coefficient W-CU composite powder is as follows:
[0051] Step 1: Preparation of the front drive
[0052] Pasteneate (AMT, ALADDIN, purity ≥99.95%) and copper (Cu (NO) 3 ) 2 · 3h 2 O, ALADDIN, purity ≥ 99.5%) Dissolve in deionized water, heating and stirring to obtain a mixed solution, and the like is transparent to oxalic acid (C 2 Hide 2 O 4 · 2h 2 O, analyze pure), the precipitate obtained by stirring the mixed solution to dry the W-CU precursor.
[0053] Wherein the amount of copper nitrate and oxalic acid were added 120.70% vinylidene by mass of ammonium tungsten, 40%.
[0054] Step 2: Hydrogen reduction
[0055] The finely ground bulk precursor obtained in Step 1 in a mortar to a fine powder, the powder has a burning boat containing into hydrogen (hydrogen purity ≥99.999%) reduction furnace for reduction of three steps: First, the temperature was raised to 420 ℃, incubated 40min, the...
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